The Ford Barn

Drbrown · 01-08-2025, 01:17 PM

Be sure to bench-bleed the master cylinder before installation (some come that way) and adjust your brake pedal play as necessary. My '47 has an access hole in the floor pan - just need to lift the carpet. I have Speed Bleaders and like that they allow one person to bleed the system. Regarding brake fluid, over time DOT 3 and 4 brake fluid absorb moisture which can damage the master and wheel cylinders. I have not converted the system for use of low-absorption DOT 5 because of concerns its more easily may "leak". So I have my brake fluid changed every three years. For my '47 the shops can remove the master cylinder cap from beneath the car. Then they open all the wheel cylinders and suction the old fluid out. They pump new fluid in from below. The cost is minimal given the benefits.

01-08-2025, 01:17 PM	#7
Drbrown Senior Member Join Date: Oct 2013 Location: Glens Falls NY Posts: 1,403	Re: Under floor Master Cylinder Brake Bleeding Be sure to bench-bleed the master cylinder before installation (some come that way) and adjust your brake pedal play as necessary. My '47 has an access hole in the floor pan - just need to lift the carpet. I have Speed Bleaders and like that they allow one person to bleed the system. Regarding brake fluid, over time DOT 3 and 4 brake fluid absorb moisture which can damage the master and wheel cylinders. I have not converted the system for use of low-absorption DOT 5 because of concerns its more easily may "leak". So I have my brake fluid changed every three years. For my '47 the shops can remove the master cylinder cap from beneath the car. Then they open all the wheel cylinders and suction the old fluid out. They pump new fluid in from below. The cost is minimal given the benefits.