Join Date: Mar 2003
Location: Washington DC USA
Sticky brake pedal
My 1971 GTV is giving my brake problems I have never experienced before. The problem is that the brake pedal sticks in the down position, requiring a yank to release it. It only does this when the motor is running. When the car is off, the pedal comes up slowly, about a count to five.
The car is new to me and when I got it it had classic bad MC symptoms. The pedal would go to the floor and you could hear fluid flowing past the seals in the MC.
I replaced the MC with one from Centerline (CIFAM brand). The pedal is lower than I expected but hard. Other threads have discussed the shortfalls of some MC suppliers. I felt safe with Centerline as they were recommended. Is CIFAM OK stuff?
The PO had replaced the MC and mentioned that he cleaned up the booster. The booster and pedal box appear to have been cleaned and painted. Could this have been put back together wrong? (I am also having clutch problems.)
The only pedal return spring I can see is part of the booster visable up under the dash. There is a spring and cup (with a slot) concentric with the rod into the booster, that appears to push the pedal up. The cup is bearing on the yoke that pivots on the pedal, is this the right stop or is there a stop on the rod closer to the booster? What does a bad booster act like?
My suspicion of the pedal box is partly due to having clutch problems as well. The clutch barely disengages at the bottom of the stroke. In fact the car has to be shut off to be put it in reverse.
The adjuster at the pedal box is further out than the spec I found (5.25 inches). The slave moves as soon as the pedal yet the clutch fork only moves 7/16 inch (measuring at the furthest point away from the clutch). Is this sufficient? There is no return spring on the clutch fork, is this normal?
The clutch grabs fine, Is there a way to see the clutch plate to inspect for wear? What should I see?
So, the combination of the PO working in the pedal box/booster and me having wierd problems with both pedal systems makes me suspicious of that area. But the pedals seem well connected (not loose) and not binding.
Does the assembled genius have any advice or experience with these problems?
Thanks for your help! TD
1969 1750 Spider
1971 1750 GTV