Brake Pull

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Dec 27, 1999 | 03:59 PM

PAUL_2

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Brake Pull

Ive got a 90 F150 4x4 , Replaced calipers about 3 wks ago due to the truck swerving to the left when the brakes were applied .All went well after that , now its back to pulling to the left again ? I thoroughly bled the system , replaced and greased the slider pins . Im wondering if the master cylinder is on its way out ? Anyone have any troubles w the proportioning valve that screws in the master cylinder ? Im just kinda out of ideas as to what may be wrong . I didnt bleed the proportioning valve down on the frame ....wonder if maybe some air made its way in there and is causing the problem ? Anyone have troubles w the rubber brake lines to the calipers ? Any advice is appreciated .
Paul

Dec 28, 1999 | 10:35 AM

deleontow

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From: Banning CA

Brake Pull

Before you replace any parts, check your front end very good. If you have a bad tie rod, radius arm bushings, etc, it will cause the front end to pull because as you hit the brakes, it causes the the tire to move causing a pulling problem. If everything is ok, you may have a bad proportioning valve. The master cyl will not cause this.

Dave

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Dec 28, 1999 | 01:18 PM

Joe

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Brake Pull

I have the same problem with my 94 Bronco. I have replaced calipers, pads, rotors and radius arm bushings. It still comes and goes.Someone told me that the rear brakes can cause problems if one of the wheel cylinders is hanging up. I'm going to pull my hubs and check the grease seals. I don't know if this can cause the problem. My truck pulls after hard braking and then it sticks around for a couple of days and gradually goes away until the next time I get on the brakes hard again. Someone also suggested to check the rubber brake hoses.

Dec 28, 1999 | 01:21 PM

PAUL_2

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Brake Pull

Thanks Dave ,
Front end is solid ...new radius arm bushings 2 weeks ago ,tie rods , ball joints are fine too , Wheel bearing adjusted . From what I gathered from my Ford Manual , the prportioning valve on the master cyl is for the rear brakes ? I assume you meant the proportioning valve mounted down on the frame may be the problem ? This is one of those problems that is difficult to diagnose and fix other than just swapping parts till you get it right ...Thanks again .
Paul

Dec 28, 1999 | 01:28 PM

PAUL_2

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Brake Pull

Thank you , Joe
I wondered if maybe something wasnt doing its job w the back brakes ... I always look at the rear wheel cyl when I rotate the tires to make sure they arent leaking . I will fix it regardless of the problem . This is the first brake problem Ive had w the truck in 159K miles .Thanks again for the suggestion .
Paul

Dec 28, 1999 | 01:57 PM

F100

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Brake Pull

>Anyone have troubles w the rubber
>brake lines to the calipers ?
>Any advice is appreciated .

Paul,
I have seen hydraulic hoses cause lower than normal pressures due to restrictions in the hoses. The restrictions are usually found at the point where the hose is terminated to a metal line with a crimped metal collar. When the metal line is inserted into the hose, it shaves a small piece of rubber off and into the metal line. Over time, the strength of the rubber sliver erodes and begins to act like a check valve--slowing, or stopping, fluid motion in one direction and allowing it in the reverse. Without dissecting the hose, there isn't anyway to diagnose this theory as the culprit other than swapping the old hose for a new one. Suggest you try replacing your right front brake caliper hose and see if that corrects your problem.

Henry

Dec 28, 1999 | 02:50 PM

Phillip Guidry

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Brake Pull

While you are in tune to working on the brakes, adjust the back brakes 'til both sides barely contact the drum,while rotating the wheel forward.This is just as important as everything else mentioned here.Also, while inspecting the wheel cylinders, please note that just because one is not leaking doesn't mean the piston(s) is expanding the shoes. Rust buildup can stop a piston or two from moving outward as needed.
Phillip