jondhm Posted February 23, 2015 Report Share Posted February 23, 2015 Checked the GT6 after leaving it for about 6 weeks, and found the brake fluid level had dropped in the master cylinder. The master cylinder seemed to have sticky yellow residue all over the outside, and there is fluid on the bulkhead, but the pipe union does not appear to have been leaking. Can brake fluid seep out of a porous master cylinder? I have had this problem in past winters, and with previous master cylinders. Any thoughts? Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 23, 2015 Report Share Posted February 23, 2015 Never come across a pourous cylinder, unusual but all is possible do you use dot4 or ......a silicon fluid One easy test ...dot 4 washes off with water but most spills are from the cap seal its breather hole, the pipe union or seal falure out into the cabin footwell So no special clues on this one Pete Link to comment Share on other sites More sharing options...
Dick Twitchen Posted February 24, 2015 Report Share Posted February 24, 2015 Jon, Had something similar when I fitted a new master cylinder. Leak initially stemmed by reducing the level of fluid in the cylinder to about halfway and then when driving the car no leak thus pointing to the cap not sealing properly. Tried one new cap with no success, tried again with another and sorted; on investigation the 'rubber' seal was a slightly different thickness and consistency (if that is the right word). I would suspect the leak occurred the last time you used it and check the seal first, and mine uses DOT 4 which also left a similar yellowish residue on the aluminium. Hope that helps. Dick Link to comment Share on other sites More sharing options...
jondhm Posted February 24, 2015 Author Report Share Posted February 24, 2015 Thanks for the replies. Am using Dot 4. I fill the master cylinder to the line of the machined flange inside, about 1 cm down from the top. Will have a good look at the cap. This is an incentive to move ahead with a stalled project to fit a low brake fluid warning light, which would then mean I would be more relaxed about the fluid level. So far I have acquired a float from a Rover 800 and have fitted it using Araldite to a spare cap. Now I need to wire it all up, and then I will write a thread about how well it works. Roll on the Spring! Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 25, 2015 Report Share Posted February 25, 2015 Good idea, most low level warnings start with some rapidnleg work, some crunching sounds and a follow through biological attack pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 27, 2015 Report Share Posted February 27, 2015 some crunching sounds T’were those that led my other half to query her Freelander taking longer to stop than previously; I took the pads out to find… there weren’t any. Just heavily grooved backing plates. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now