[Mgs] 1967 MGB-GT Master Cylinders

David Councill dcouncill at karamursel.org
Thu Nov 30 14:43:26 MST 2017

Yes, I have done this many times. It is much easier to remove the pedal box with cylinders rather than just the cylinders (although I have removed just the clutch master cylinder on many occasions – that is from 40 years of ownership). But it is much easier to remove the pedal box assembly than to put it back in. The right tools help – such as magnetic tip screwdriver extension to get the side cover bolts back in. Some work under the dash including pulling the rubber access cover out to get to the back. Its not a difficult removal but it can be tedious, particularly with the hydraulic lines where you have limited room to tighten/loosen them. And if you are replacing the master cylinders with new/different units, it may be a bit difficult to get the hydraulic lines to line up just right to tighten the fittings. The main thing is to take your time and have a fair bit of patience.


Then there is the replacement cylinders. I tried to stay original but ended up replacing the brake master cylinder on my 64B with one of those plastic reservoir units due to the cost and time of refurbishing one of my old square metal canister units (needs resleeved). Granted, its easier to check and add brake fluid with the new units but I will likely revert to original some time in the future.


David Councill

64 B

67 BGT

72 B


From: Mgs [mailto:mgs-bounces at autox.team.net] On Behalf Of David F. Darby via Mgs
Sent: Thursday, November 30, 2017 11:33 AM
To: mgs at autox.team.net
Subject: [Mgs] 1967 MGB-GT Master Cylinders


It’s good to see some new chatter on this list. Did everyone go off to FaceBook or something?


I’m preparing to replace both the brake master cylinder and the clutch master cylinder. I’ve not done this job on the MGB (1967 GT, single circuit) before and I’m not quite sure how to proceed. The workshop manual just says to disengage the pedals, disconnect the pipes, and remove the fixing bolts. The space around the hydraulic lines and the cylinder fixing bolts is very tight and I’m having trouble making my arthritic hands work in there. Has anyone done this before and have any useful tips?


Thanks for any help.





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