1972 VW camper offside front calliper brake keeps locking and gets very hot. I have stripped down the brake and find that the two pistons are free but won't move independently, i.e. you cannot seperate them to insert the brake pads and if you push one piston in the other moves and vice-versa. The result is that operating the foot brake applies pressure to the disc which isn't released when the foot brake is taken off. Can not understand what's happening and any help welcome.
Many thanks
Edited by Dynamic Dave on 21/09/2008 at 13:17
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What else is on the same brake circuit?
Between the brake caliper and the fluid reservoir, there's a problem. By opening the circuit at different points, you can find where the blockage is.
The circuit on a vehicle of this age must be fairly simple, and my guess would be that you find yourself fitting a new flexi. However, don't be guided too much by my guess, diagnose the problem systematically.
Edit: forgot to ask, is there a differential pressure valve and warning lamp?
Edited by Number_Cruncher on 20/09/2008 at 22:49
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Thanks - There is no pressure valve and no warning lamp. The flexi hose sounds worth pursuing but it operates fine on the pressure stroke - woud ithe fluid really only be blocked on the return journey. Trying to imagine what inside of the flexihose may look like to alow blockage in one direction only.
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if the pressure releases when the bleed nipple is undone then it has to be fluid not returning and the must likely culprit will be the flexy collapsing internaly
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It isnt blocking in only one direction. But the pressure applied when you press the brake is sufficient to force fluid through the constriction. The caliper doesnt exert enough pressure to force it back through the restriction.
Change the flexy.
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Thanks for the replies - old brake flexi hose - this has got to be the problem so two new flexi hoses are on order.
Thanks
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