I have a 1997 Ford F-250 Light Duty which is the oddball with the 7 lug wheels.
The brakes went out COMPLETELY a couple months back during a cold snap and a rear wheel cylinder was to blame. The fluid poured out as fast as I could put it in.
Anyway, due to time and weather constraints, I decided to take it to a shop. Since the truck essentially had two or three good brakings in it with a full fill of brake fluid, I went to the closest place to my house, only about 3 miles away. It needed new shoes, hardware, wheel cylinders, and drums on the rear.
I don’t think the shop did a very good job. For one, I don’t think they even drove the truck after the repair. The first time I hit the brakes there was a tremendous shaking from the truck. Then I began to smell the brakes smoking. I took it back a few days later and the parking brake cables were rusted so he replaced them. I don’t think he adjusted the one set of shoes back in as I was still smelling the brakes. I was able to work the drum off and adjust the brakes back in myself and there is no more smell.
The shaking is still there. Here are the symptoms.
- It shakes very little under light braking but gets worse as you press harder.
- You can feel pulsing in the pedal.
- Slowing down from 50-60 mph to about 20 is when you really feel it. You seen to hit the resonant frequency of the whole truck when slowing down to turn and the whole thing really shakes.
- I don’t think it is the front rotors but have purchased a set of rotors and pads that remain in the package for possible return. I don’t feel it in the steering wheel like where it tries to pull from side to side. The whole truck shakes so you do feel it in the wheel but I don’t think it is coming from the front brakes.
- I took the truck out and got it going pretty fast in reverse and hit the brakes a few times, mainly to make sure the rears were adjusted. THERE WAS NO SHAKING UNDER HEAVY BRAKING IN REVERSE.
- There was no shaking at all before the brakes failed on me a couple months back. It started immediately after the repairs. I can’t see another problem masking warped front rotors.
- “The seat of my pants” feeling is that it is coming from the left rear wheel.
- Frequency of shaking is correlated to wheel speed. Faster speeds = higher frequency of shaking.
Another buddy used to be really big into Mustangs. He says that maybe a bushing is bad/split. I am going to get under and look at this today as he said it should be clear to anyone if there is a problem. He says the bushing was bad but the weight of the truck never allowed it to slip out of place. Then when it was put on the lift at the shop, the bushing might have slipped out of place and the problem started.
Any other suggestions? I am going to get under and see if anything looks out of place where the suspension mounts to the frame around the axle and differential here in a bit but besides that, I am at a loss. I will plan to take it to another shop that I trust more now that the brakes are working if I can’t figure it out.