• Hi Guest!
    If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

Master cylinder

Share this page

longbridgehealey

longbridgehealey

Obi Wan
Country flag
Offline
I just ordered a new one. Should I bench bleed it before I install it, or is this not necessary?

thanks!
 
Definitely! I actually prefer to "firewall" bleed them myself, since the time it takes to get it into the car can allow the ingress of air.

If you've got a scrap brake line, cut and configure it to squirt back into the reservoir, and pump your heart out.

IMG_3232.jpg
 
Someone will surely chime in with a more sophisticated way, but I mount the cylinder level in a vise, carefully pour fluid into the intake port and gently work the piston until nothing but fluid comes out of the outlet port. Then, install the cylinder on the firewall trying not to spill any fluid. I'd call Randy's method a 'pre-bleed' or 'partial bleed' since it's not done on the bench. Certainly, a good way to do it--I might try it next time myself.

I'm not sure there's a great advantage to doing this--esp. on a servo'd car since I don't know of a method to 'bench' bleed the servo cylinders--but it might help getting the last bit of air out of the M/C. I think pressure bleeding is the best way overall--I have a reservoir cap with a Schrader valve installed to which I can apply pressure from a regulated compressor output.
 
Someone will surely chime in with a more sophisticated way,

YEP;
Seems like Randy just took all the pain out of bleeding one--Keoke-:encouragement:.
 
Back
Top