Brake Pedal Goes To Floor After New Master Cylinder

Many drivers have reported that brake pedal goes to the floor after new master cylinder replacement.

Brake pedal goes to floor after new master cylinder.

2 check the brake master cylinder. Brought vehicle into shop and checked over pedal is soft if you pump it several times it holds breifly and then fades away the rear brakes were junk there were chunks out of the rotors replaced rear brakes there are no lines leaking on vehicle replaced the master cylinder. The condition can be caused by the piston sticking in the bore of the master cylinder during the bleeding process when the brake system is manually bled. Brake pedal goes to floor troubleshoot fix in under 45 minutes check for brake fluid leak.

Mechanic said brakes are fine but don t know if i should trust that. The first thing to check when your brake pedal goes to floor is to raise the hood and check the brake master cylinder s reservoir. If the reservoir is empty or the brake fluid level is low there is most likely a leak somewhere in the brake system. Any idea on what might be causing this.

Ensure master cylinder is bench bled prior to installation. Brake pedal has been going to the floor barely slowing the car. The brake pedal will go to the floor and subsequent efforts to get a satisfactory brake pedal will fail. A no brake pedal condition can be encountered after a new master cylinder is installed leading the technician to believe that the master cylinder is defective.

A good indication of this condition is lack of fluid flow from the brake bleeders. Brake lines don t appear to be damaged one was replaced after wear but still no change. Put in new master cylinder no change. Often the culprit is a leaking caliper or wheel cylinder seal.

If this is indeed the issue the brake master cylinder must be replaced with a new one. The second action you can take is to check the brake master cylinder as it has two sets of seals which can wear in time and cause leaks. Have to floor brake pedal to stop the car. This happens mainly if no air bleeding was done after installing a new master cylinder and thus there is air in the brake lines.

Follow the vehicle s manufacturer specified bleeding procedure. Check the brake fluid level. Anytime you have a brake pedal that goes to the floor raise the hood and locate the brake master cylinder s reservoir using a flashlight check the level of the fluid or just remove the lid of the reservoir and look inside.