Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

Problem Solved

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Brutus:
That would seem the obvious thought, but sometimes physics like tp play nasty mind games with normal thinking people. All I can suggest is that you check your runout and see where that leads you. Saying all this tho, I must admit to not having done my own yet, but I'll be checking them out as soon as I lay my hands on a dial indicator.

Bob

MR 69ER:
Thanks for that Bob I'll be checking them next chance I get. Once I too get hold of a dial guage.
Steve:20:20:20

Twin_Turbo:
The V lip seal is designed to keep fluid from leaking out under pressure, unfortunately it's great at letting air in (when the piston moves yet there's no pressure on the fluid side of the piston to keep the air grom getting in)

This seal acts like a piston pump and it SUCKS! IT's a the source of about all caliper related problems, not only does the trapped air make your pedal feel soft, it also means moisture gets in, the fluid deteriorates and the water wills tart to boil when you're on the brakes, also it will corrode all the inside of the caliper causing sticking pistons and even more leaks.
To fix it check rotor runout AND bearing play on the wheels involved. If it's the rotor, shim it as good as you can and if you can't get it spot on have the rotor trued. Replacing the seals in the calipers w/ o ring design stuff is a very good idea.

77CVT:
Steve - I feel your pain!  I went through this for years and there is only one thing to check and that's the runout with the disc bolted up on the car.  Were the disc's machined on the car?  If you can get it around 4 thou that's good but shoot for under 8 thou.  I ended up shimming (which is not recommended by others) the fronts on my old '77 prior to the Canberra Convention.  By the time I got down there my pedal was to the floor! ;eek   It was the rears that were the problem then.

I took the springs out from behind the brake pistons on the fronts and after the convention I took the rears out and my pedal was fine from then on.  Don't let people fool you into thinking taking the springs out is a no-no!  :b4

C3 brakes work great but are a real PITA at times!  O ring seals are the way to go but you MUST fix any runout problem first or you are wasting your time.

George80one had a problem with his rear hub not running true so it is not always the disc.  That is why I shimmed my fronts.

Good luck!


PS. - Are you going to Bathurst again this year?

MR 69ER:
Thanks for that everyone & I will be checking the run out on the discs very soon. Yes Chris I am heading up to Bathurst again this year but this time for a different cause. We (Corvette Owners) will be doing the driver parade lap before the big race on Sunday morning. YEAH HA. As it is our 50th Anniversary they wanted Corvettes to do the lap this year instead of the traditional Mustangs. There are about 15 cars from Sydney heading up early on Sunday morning with the rest of the group (About 40) comming from the Canberra club. Hence trying to sort out my braking problem before streaching the RED ROCKETS legs down Conrod should be a great day. Are you making the trip again?:20:20:20

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