D
Docmallory
Guest
I've noticed my 80 pulling to the left when braking, especially hard braking. Front pads and rotors are new (3 months old), as is the left caliper. I went ahead and replaced the front right caliper but this did not help the problem.
I then went to the rear of the truck. Took the right rear caliper apart and it didn't seem stuck and the pads looked fine. I went ahead and bled that brake caliper for the sake of thoroughness. Surprisingly, I got a stream of bubbles in the fluid. (I had flushed the brakes just 3 months ago with the Motive power bleeder.) Once this cleared, I put it all back together and road tested it. Problem solved - brakes were straight and true.
Fast forward to now, a week later. Truck has again been pulling left, and once again a bleed of the right rear caliper gets a stream of bubbles. After a re-bleed tonight (putting teflon tape on the threads of the bleeder screw too, just in case), the brakes are working correctly again.
So, here's the puzzler - where is the air coming from?
I carefully inspected the brake lines in the rear (including proportioning valve) and there is no damage and NO LEAKS of brake fluid. The bleeder screw was dry. I can see no evidence that brake fluid is coming out anywhere (as I would expect if air were coming in)
I am 100% sure I did not introduce any air into the system any time I have used the power bleeder. That is, I did not run the master cylinder reservoir low at all.
Could it be the seals in the caliper?
I then went to the rear of the truck. Took the right rear caliper apart and it didn't seem stuck and the pads looked fine. I went ahead and bled that brake caliper for the sake of thoroughness. Surprisingly, I got a stream of bubbles in the fluid. (I had flushed the brakes just 3 months ago with the Motive power bleeder.) Once this cleared, I put it all back together and road tested it. Problem solved - brakes were straight and true.
Fast forward to now, a week later. Truck has again been pulling left, and once again a bleed of the right rear caliper gets a stream of bubbles. After a re-bleed tonight (putting teflon tape on the threads of the bleeder screw too, just in case), the brakes are working correctly again.
So, here's the puzzler - where is the air coming from?
I carefully inspected the brake lines in the rear (including proportioning valve) and there is no damage and NO LEAKS of brake fluid. The bleeder screw was dry. I can see no evidence that brake fluid is coming out anywhere (as I would expect if air were coming in)
I am 100% sure I did not introduce any air into the system any time I have used the power bleeder. That is, I did not run the master cylinder reservoir low at all.
Could it be the seals in the caliper?
