Spongy Brakes advice
Discussion
jagracer said:
littleredrooster said:
What's the relevance of that? Have I missed something?
They can create a lot more vacuum in the servo and the pedal can creep to the floor, I have this on my Landcruiser, turn the engine off and pump the brakes and the pedal is solid.
cptsideways said:
You have a seized caliper slider then
Thanks for the heads up on that I'll check them out although I can't see how that would cause creep. I did fit new pads and discs on the rear last year and the callipers seemed to be OK but I'll have another look. I was tempted to fit another MC but the £300 price tag put me off.Has it got drums on the back ? Leaking rear cylinders can cause what you describe and is a fairly common problem. (edit: you don't have drums on the back, doh!)
If its calipers all round then get all the wheels off, check for any visible signs of fluid leaking, ask an assistant to push the pedal hard with the engine off and check none of the brake hoses are ballooning then take each caliper off, check you can squeeze the piston(s) back in and that the sliders are free as suggested above. Reassemble, bleed the system through and see if that fixes it.
Don't forget to pump the pedal up before you try and drive it anywhere
If its calipers all round then get all the wheels off, check for any visible signs of fluid leaking, ask an assistant to push the pedal hard with the engine off and check none of the brake hoses are ballooning then take each caliper off, check you can squeeze the piston(s) back in and that the sliders are free as suggested above. Reassemble, bleed the system through and see if that fixes it.
Don't forget to pump the pedal up before you try and drive it anywhere
Edited by Jimmyarm on Monday 21st February 18:48
jagracer said:
littleredrooster said:
What's the relevance of that? Have I missed something?
They can create a lot more vacuum in the servo and the pedal can creep to the floor, I have this on my Landcruiser, turn the engine off and pump the brakes and the pedal is solid.jagracer said:
Thanks for the heads up on that I'll check them out although I can't see how that would cause creep. I did fit new pads and discs on the rear last year and the callipers seemed to be OK but I'll have another look. I was tempted to fit another MC but the £300 price tag put me off.
The creep is caused by the caliper mount flexing instead of the sliders sliding. I have a perfectly good MC here for an early 80 series if you do need one.cptsideways said:
The creep is caused by the caliper mount flexing instead of the sliders sliding. I have a perfectly good MC here for an early 80 series if you do need one.
This I don't underdstand. Once the caliper has flexed surely the creep should stop? I thought creep could only be a fluid leak or maybe a servo problem. 
Ozzie Osmond said:
This I don't underdstand. Once the caliper has flexed surely the creep should stop? I thought creep could only be a fluid leak or maybe a servo problem.
Agreed. If the pedal goes to the floor it has bugger all to do with sticking calipers.Something is leaking, either a calliper, slave cylinder, pipe or union leaking fluid, which would show as a pool of brake fluid on the floor and the level in the reservoir dropping or the master cylinder seals leaking which may not show any signs of leakage, or may be leaking a little into the car where it gets soaked up by the carpet.
If a caliper slider is seized there can be enough lateral flex to get the impression of a leak - eg brake pedal goes to the floor, pumping the pedal you eventually get a solid pedal.
I had this about 3 weeks ago & it took me a while to figure out what was going on, there were no leaks, a new MC did'nt fix it & no amount of bleeding either. It was a slider seized solid on the rear.
I had this about 3 weeks ago & it took me a while to figure out what was going on, there were no leaks, a new MC did'nt fix it & no amount of bleeding either. It was a slider seized solid on the rear.
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