Folks.
A friend has a 100 that he has been driving for several years after it was restored by the previous owner. My friend was driving home and lost all brakes. There was no loss of brake fluid. The car has synthetic Dot 4 fluid (not silicone).
I suspected that he had a brake lock up and over-heated the brake fluid. However, after the car sitting for days, there was still no brakes, still no loss of brake fluid, and the brake pedal still went to the floor.
He removed the master cylinder and we discovered a small tear in the plunger rubber seal. Rebuilding the master cylinder does not appear to have solved the problem. We cannot get the air out of the lines.
One thought is that air is entering the hydraulic system somewhere. All connections and bleed screws are tight. One would think that if air was entering the system, brake fluid would be leaking out somewhere, but we can not find any evidence of a leak.
It appears that the wheel cylinders were rebuilt (not replaced with new) during the restoration.
Today, we are going to try bleeding the system with a pressure bleeder.
Any thoughts?
Thanks.
A friend has a 100 that he has been driving for several years after it was restored by the previous owner. My friend was driving home and lost all brakes. There was no loss of brake fluid. The car has synthetic Dot 4 fluid (not silicone).
I suspected that he had a brake lock up and over-heated the brake fluid. However, after the car sitting for days, there was still no brakes, still no loss of brake fluid, and the brake pedal still went to the floor.
He removed the master cylinder and we discovered a small tear in the plunger rubber seal. Rebuilding the master cylinder does not appear to have solved the problem. We cannot get the air out of the lines.
One thought is that air is entering the hydraulic system somewhere. All connections and bleed screws are tight. One would think that if air was entering the system, brake fluid would be leaking out somewhere, but we can not find any evidence of a leak.
It appears that the wheel cylinders were rebuilt (not replaced with new) during the restoration.
Today, we are going to try bleeding the system with a pressure bleeder.
Any thoughts?
Thanks.