Brake Pedal goes to floor
#1
Brake Pedal goes to floor
I have a 1984 Accord. I am losing brake fluid but do not know where. The brake pedal goes to the floor. I have checked all four wheels, no leaks at the wheel cylinders, I do not see a leak at the master cylinder.
What am I missing?
What am I missing?
#4
Do you also have failed-booster symptoms? E.g., hissing sound, pedal feel not changing when you start the car?
I seem to recall that it is possible for the MC to leak fluid into the booster and then have it sucked into the intake manifold. Check the inside of the booster vacuum line for fluid.
Roy
I seem to recall that it is possible for the MC to leak fluid into the booster and then have it sucked into the intake manifold. Check the inside of the booster vacuum line for fluid.
Roy
#5
Leaks in the 4 brake cylinders/calipers would have to leak OUT, so you'll find evidence of the leak.
Master cylinder is the only place where it can leak internally. It leaks back into the reservoir as it loses pressure. The classic description of a bad MC goes like this:
- Brakes feel nice & normal when you first apply them. Not soft.
- Pedal sinks smoothly to the floor while you're holding it, say at a red light.
Master cylinder is the only place where it can leak internally. It leaks back into the reservoir as it loses pressure. The classic description of a bad MC goes like this:
- Brakes feel nice & normal when you first apply them. Not soft.
- Pedal sinks smoothly to the floor while you're holding it, say at a red light.
#8
Yeah, that's true if he has to keep adding fluid.
A neighbor had one where it was leaking past the MC piston rod & filling up the vacuum booster. That thing can hold a lot of fluid before it starts leaking out.
A neighbor had one where it was leaking past the MC piston rod & filling up the vacuum booster. That thing can hold a lot of fluid before it starts leaking out.
#10
Carefully check the length of the pushrod, old vs. new mastercylinder. If they are different, there's a procedure (using a strange proprietary tool) to adjust the pedal pushrod. Hopefully they'll be exactly the same.