It’s nice that Ford finally added rear disc brakes to the Super Duty trucks and vans in But what about those who have the style F and trucks? Surely they would like the same braking performance. The objective here is to convert my Father’s F from rear drums to rear discs. We poked around a few junkyards and stumbled upon several late model Ford airport shuttle vans with Powerstroke engines and full floating Dana 60 rears which all had disc brakes. Looking at my brother’s F we noticed the brakes were very similar, just that the truck’s calipers were finned while the van’s were not. Right away we knew this was not going to be a “bolt on kit” to get the van brakes onto the truck axle. The reason we went with the van brakes is because the vans still retain the 8 on 6. Not having to buy wheel adapters saved us an arm and leg, not to mention the junkyards in our area are full of vans, not Super Duties.
brake problem, proportioning vavle
I originally had 4 wheel drum brakes and knew I needed to do something different. Click here for that write up. That was a major improvement. But I wanted more braking power.
Description Price Part # Adjustable Front Strut Set (2) by GAZ – for a Triumph TR7 and TR8. GAZ struts have a Zinc plated body that resists salt spray and road grime and looks great.
First I know there are many different ways of doing this and using different parts to substitute for what I used. I wanted everything to be as simple of a swap as I could make it. I also wanted all new parts, so this will be wrote using the parts I bought and the way I designed my conversion. I started up front in the engine bay. Use a syringe to siphon the brake fluid from the master cylinder.
Take the brake lines off the master cylinder. Be prepared to catch any fluid that comes out and remember, it does remove paint. With the lines off, take the master cylinder off. Next, you will need to remove the combination valve. It’s mounted to the radiator cradle up under the fan shroud.
64 Good Photos Of Proportioning Valve On A Front Wheel Drive Car
Posts 5, Proportioning pre-WB is done by a restricting valve that is in the rear part of the distribution block, where the fail light switch is mounted. Alternatively you may find that you can remove the nylon valve poppet from the drum valve to give you equivalent brake pressure front and rear but beware – this may result in too much rear brake bias which is bad. The residual pressure valve for a factory, people change things HX is in the master cylinder outlet as I described above, what morcs is talking about is the separate one that was inline with the rear brake line in HQs.
The existing master cylinder can be utilised with a separate proportioning valve simply by removing it use a screw or ez-out to carefully remove the brass seat, remove the valve from behind it, then replace the seat. If you do not remove this valve it will hold the rear brakes on drums require residual pressure to keep the shoes out ready for use, discs don’t. If you go the WB master route everything still basically applies, its just that the proportioning valve is physically built into the same housing as the master cylinder you will see it has two bores side by side and you can eliminate the separate proportioning valve.
Jun 29, · Make sure that the master cylender is bleed befor you hook the lines up to your brake system. I beleave that you may have pushed the brake beddel to far alowing the proportioning valve .
Budget g-machine Brakes for Musclecar Mopars Cordobas actually are good for something Written by Andy Finkbeiner Photos by Ron Valera One swap that is starting to gain popularity among Mopar owners is the use of later model disc brakes onto their classic musclecars. Fortunately, there is a fairly inexpensive way to put the best factory brakes this side of a Viper onto your Mopar musclecar.
What makes this swap work is the fact that Chrysler engineers left the basic front suspension design alone from to on the B-body Mopars. In addition to that, they used a common parts bin solution for many years after in an effort to save money. The net result of this economizing is that we can now pick and choose the best factory parts and have them all work together. For those of you new to the Mopar world, A-body refers to the smaller line of cars such as the Duster, Dart and Valiant.
Bob Johnstones Studebaker Resource Website (Brake Systems on Studebakers)
July 8, is it possible that the blockaged is actually in the proportioning valve? Please try to use proper capitalization. You said you tried at the master and at the wheel cylinders, and the proportioning valve. The clog could be anywhere between the master and the prop valve. Is the prop valve in the 73 in front or in back? If it’s in back, there is a lot of line in between.
Dec 15, · My proportioning valve stuck because the rear brakes gave out and the front took over and stuck the valve in the rear closed position. When you pump the brake hard you will hear the valve click to front close because it acts like you lost front brakes.
In a nutshell, no. Chrysler rarely ever used a true proportioning valve on any of their vehicles, trucks included. A proportioning valve limits the psi to the rear brakes. Chrysler usually handled this by balancing the size of the front and rear brake components. The only time a proportioning valve should be used is if you are having issues with the rear brakes locking up before the fronts, or you are running 4 wheel discs.
The master cylinder plays a large role also. Calipers require a lot more volume, compared to cylinders, which is why the master cylinders must always be swapped. Typically what you will find is a Combo valve, which will include a distribution block, warning light switch and sometimes a metering valve. Chrysler hasn’t used residual valves for over 20 yrs. When used, they were screwed into the ports of the master. However, they changed the design of the wheel cylinders in the early 80’s to include a spring for this function.
ALL aftermarket wheel cylinders will have this spring. So if the wheel cylinders have been replaced in the last 20 yrs, you should have the spring. Metering valves were sometimes used to delay the engagement of the front discs to allow the rear drums to energize.
How to Install a New Brake Master Cylinder
I have a 98 K with an 5. I just installed a proportioning valve thanks to that Draggin guy’s good advice to make the process simple. I grabbed the proportioning valve from a 94ish truck at the wrecker. Everything is good except for the brake warning indicator light. Because the circuit closes when there is uneven pressure, the light coming on won’t be an issue without the wire hooked up, but I wouldn’t mind wiring it in.
There are 2 wires at the stock PV sensor and 1 wire at the 94 PV wire sensor.
and/or recycling chutes to control odor and bacteria (hook-up by others). The unit is comprised of a reservoir tank and proportioning valve which is located above the top intake of a chute.
The anti-skid system ABS will help mask this problem by pulsing the front brakes until you apply enough pressure to cause the rears to start to lock up and hit ABS. This is not optimal though, it is better to keep the spacing between when the front brakes lock up and when the rears lock to a minimum but you do want the fronts to lock up first.
With a proportioning valve you can reduce the brake pressure going to the front brakes so that the front brakes lock up just before the rears. You just insert the valve into the front brake line and then dial down the pressure. Summit Racing and Jeg’s sells several proportioning valves. A brake pressure gauge will install the same way as a proportioning valve. Summit and Jeg’s sells brake pressure gauges. What’s a Brake Line Lock? A brake line lock will install the same way as a proportioning valve.
A line lock allows you to apply pressure, hit a switch that will hold the pressure, release the brakes and the front brake pressure remains locked but the rears are free for a burn out–Saturday night fun!
Bleeding the rear brakes
Asheville, North Carolina, Ships to: General Motors most widely used disc drum proportioning valve. This valve will work on both cars and trucks, GM, Ford, Mopar, etc This proportioning valve helps to restrict the amount of pressure sent to the rear brakes under heavy braking, helping prevent the rear brakes from locking up to soon. What differentiates this valve from the adjustable valves and the similar drum brake or disc disc valve is the metering spring built into the back of the valve.
This metering spring helps to slightly “hold off” the drum brakes from engaging right away, keeping the rear brakes from “locking up”.
Disc Brakes – If you are converting to disc brakes with dual master, simply mount this block in the same location, hook up the right and left front brake lines and hook up the front to rear. The top 2 ports are left – You will have to make 2 master cylinder lines in 3/16″.
The metering valve all cleaned up: This was very cruddy when I removed it. The brass rod is supposed to pass cleanly through the cap, it was rusted in place. This valve requires pipe dope to seal in its bore, no O-ring. There is a tiny snap ring holding everything together, you can remove it with a small screwdriver to clean it all separately. Take note of how the brass plunger and tiny spring are oriented. The plunger has to be placed in the bore on re-assembly and the spring can be wedged into the tip of the valve.
Alright, so here’s the proportioning valve. Mine had the nylon bushing, with a tiny o-ring below it. Plenty of rust and crud in the cap, which was holding the plunger down. Probably had something to do with the failure of the valve. I believe the piston seal goes on the tip of the plunger as shown. Maybe it goes the other way, lip to the top. I’ve sent a message to the producer of the kit asking for his advice..
proportioning valve centering: how do you do it
EGR or Exhaust Gas Recirculation is a system that takes exhaust gas and recirculates it back into the intake air, this does a few things beneficial to the actual running quality of the engine such as: Reduce Combustion Temperatures which dramatically cuts down on Spark Knocking detonation which is… a common occurance on a high-compression engine such as the LT1, and reduces the NOx oxides of nitrogen emissions caused by high compression which fails emission tests.
Looking face on at your engine, the egr valve is to the left and a bit forward from the power brake fluid resevoir. It is to the left of the power brake booster. There should be an electrical component right on top – it will have the Chrysler logo on it if it is still factory part.
The proportioning valves are not serviced separately from the junction block. Vehicles with this type junction block no longer have proportioning valves mounted at the rear brake flex hoses.
A little pricier than these Rock-Ett reconditioned Mercury brakes from Dana axles, advertised in right. There are a number of other vehicles, typically from the ‘s, that have been used as donors for this conversion see further down this page. Jon Paulsen described installing an inch brake kit available in the late ‘s: You don’t need to do any assembly, because everything is already assembled to the new backing plate, just bolt it up, hook up the lines and bleed ’em.
Count on a weekend, but well worth the effort. I still have the small ones on the rear, and it works fine. Before, I could never get the front ones to lock on road, even with good pads and fully adjusted. Now they seem well balanced. The front brakes will skid when braking hard, and the rear will occasionally make some noise too. The rear brakes don’t completely lock up. You should thoroughly test any brake work before street operation.
Modifications to brakes need even more thorough testing.
Brake Proportioning Valve Install
Inside the block is a piston when pressure is lost in either ciruit the piston is pushed by the pressurized side twords the other and activates the switch turning on your brake light on the dash. The plunger swithc on the end is to activate your brake lights. I’m not sure what car that is out of but somehow the pedal assembly or linkage depresses that plunger switch when the brakes are not in use and when you depress the brake pedal the plunger switch is opened up and the brake lights go on.
Another big thanks goes out to Steve for helping me understand the process, building the adapter plate for the firewall, the adapter between the HB and MC and bending up the prettiest brake lines from the MC to the proportioning valve!!!
What is Hydraulic brake booster? It runs off of your power steering pump. If it runs off my power steering pump and my pump dies, the belt brakes, or the engine quits how do I stop? Well if you have vacuum brakes and your engine quits how do you stop? On manual brakes, and isn’t that a grunt? So, there is an advantage to Hydraulic brake booster in those circumstances because it has an accumulator for residual pressure in the event of losing the pump.
The accumulator is the gold cylinder usually seen on the right side of the unit, and it’s filled with 1, psi of nitrogen and when your pump is running it fills the chamber with power steering fluid and compresses a piston.