shaft1

I removed the master cylinder to replace the brake booster of my '93 --- it just would not come out without removing the MC. Brake fluid needs to be changed anyway.

My question is do I need to bench bleed the master cylinder or can I just reinstall everything and proceed with the usual bleeding process?

I did a bench bleed one time (few years back) and from what I can remember it was a pain.

cardo0

U would think u could bench bleed the M/C in the car but when I last tried it decades ago it really didn't work. The object is to get the air out of the M/C chambers using plastic tubing to recirc back into the reservoir. Then seal it up and install. Something bout when install u don't get full travel or the angle of M/C doesn't bleed right.

Well good luck and let us know what works.

antfarmer2

Start fresh and bench it if old since it is off might just replace to match.

Chrly919

Usually bench bleeding is for new MC to avoid 'flipping ' the seal, according to the last one I got from AZ. I've always been lucky when I didn't bench bleed, except once. They took that one back and it was fine after I bench bled it. It lubes the seals.

shaft1

Roger that. Now I'm thinking of bench bleeding it since I need to remove and clean the reservoir due to all the junk in it. Thank you for all the input.

JrRifleCoach

IF the MC is pre-bled on the bench, there is less air introduced into the system when bleeding. Unless you start at the wheels.