No, that's usually either the caliper or a corroded slide. It is also possible that a faulty proportioning valve could do this. Also, in ABS equipped vehicles, some part of the ABS system's valving or controller may be faulty.
Any sudden brake loss can be the cause of 1. brake line damage 2. master cylinder disfunction
If it does this in all gears, I bet your clutch is shot. Other things that could cause problems are the Clutch master cylinder or clutch slave cylinder.
Check around brake pedal for something rubbing. If OK, I'd look into the master cylinder.
If you've changed the slave cylinder and bled it several times, the next step would be to check the MASTER cylinder and if that doesn't work then your clutch is burned out.
Your pedal will go to the floor for a few reasons. First, your master cylinder may be defective and/or empty. The master cylinder will be empty for a reason. Any or all of the wheel cylinders may be leaking, the brake hoses may be leaking or broken, a steel brake line may be rusted through and leaking or broken. A loose fitting will cause a leak too but this is not likely the case on such an old car. I would suggest you fill the master cylinder, bleed the brakes and when done, look for leaks. If you don't find any leaks and the pedal still goes to the floor, the master cylinder is likely bad. Carl King http://www.classiccarauto.com
This could be caused from the closing off of the flex line or a bad caliper or a bad master cylinder
You've either got a bad Brake hose or bad master cylinder. Both these things can cause a caliper to stick.
If the front brake caliper is sticking, the disc may be uneven. Brakes that are left to scrape on the disc for a long time before they are changed will damage the disc enough to cause sticking or slipping.
If the front brake caliper is sticking, the disc may be uneven. Brakes that are left to scrape on the disc for a long time before they are changed will damage the disc enough to cause sticking or slipping.
A rotted brake line, a leaky front caliper, a leaky rear wheel cylinder, a leaky master cylinder,
Perhaps a bad master cylinder--return plugged or restricted As friction develops at rotors brake fluid expands and pushes back into master cylinder if return is restricted, expanded fluid will cause caliper piston to put pressure on rotor, essentially applying the brakes NOTE: I had same problem with front left and it was the Caliper, had to rebuild the caliper
It was the clutch master cylinder. It finally went completely out. I checked the slave cylinder, it looked and operated ok, so I assumed it was the master cylinder, I replaced it, it works now.
Caliper sticking - take off caliper and try to push back piston into the caliper bore (if possible with the bleeder open) Flex hose restricted -Remove from caliper, take lid off of master cylinder and see if fluid runs out at a good pace (don't let it go empty) Pads stuck in caliper hardware - remove caliper and make sure pads move freely. Calipers may act different from hot to cold, when does it not release? Check it when its acting up.
The caliper is probably sticking. With the car jacked up and on a jack stand and the wheel removed, see if you can turn the caliper. You can probably see what's sticking this way.
Try Changing the Brake Hose. They Rot On The Inside And Restrict The Flow Of Brake Fluid Back To The Master Cylinder. GOOD LUCK
The main cause of uneven wearing brake shoes is a sticking or stuck caliper. Check to see if the caliper is releasing properly all the time.
One cause is that the cylinder the caliper piston moves in has scores - grooves worn in the cylinder walls that the edge of the piston is catching on. One of the easiest approaches would be to replace the caliper with a remanufactured / rebuilt one.