BLEEDING brakes

Post by **tingo** » Tue Oct 06, 2009 8:37 pm

Can't help any more than has already been said about fixing the problem, I always struggle too.
Do you know that you can reuse the fluid you are pumping through. 6 litres sounds expensive, all you have to do is store the fluid in a jar for 24 hours to let all the bubbles out and you can use it again.

Post by **bigjohn** » Tue Oct 06, 2009 8:38 pm

[quote="DAVIDMCCULLOUGH"]Is the rod that works the master cylinder fully adjusted up? This may help with the pressure.

yes i adjusted this and there was about an inch of movement before anything happend so i adjusted it and theres about 5/6 mm of movement but still didnt resolve the problem

i will try jacking car up tomorrow then i will let you know

Post by **DAVIDMCCULLOUGH** » Tue Oct 06, 2009 8:46 pm

Sorry meant to add, when leaving it jacked up keep the pedal pressed down slighty ( wedge it with a piece of wood against the seat) to keep some pressure in the system.

Post by **PSL184** » Tue Oct 06, 2009 10:21 pm

DAVIDMCCULLOUGH wrote:Sorry meant to add, when leaving it jacked up keep the pedal pressed down slighty ( wedge it with a piece of wood against the seat) to keep some pressure in the system.

The top hat seal in the master cylinder should maintain the pressure in the system - I suspect this has failed or is missing. Hence the question I aked about the parentage of the master cylinder which John did not see or chose not to answer....?
If you can pump the pedal up hard and then it goes soft again almost straight away its because of this seal....

Post by **bigjohn** » Tue Oct 06, 2009 11:48 pm

sorry rich the mastercylinder is a lockheed brand new from bull moffit i am going to take of tomorrow and having it tested in the mean time i am going to fit the one off the 1970 scrapper with was working fine

Post by **PSL184** » Tue Oct 06, 2009 11:50 pm

I suspect the seal is missing, faulty or in upside down mate.....

Post by **southerly95** » Wed Oct 07, 2009 11:54 pm

Guess we all have our tales to tell re bleeding MM brakes. You are of course starting with the rear, what worked for me was for wifey to pump the pedal hard and top the M/C up - I removed the bleed nipple and used my thumb to block the slave cylinder on the brake pedal return stroke. Like that you get a larger quantity of low pressure/higher volume fluid through to dispell the air than you do with the bleed nipple in place.

Post by **bigjohn** » Thu Oct 08, 2009 12:16 am

i havnt done anything with the brakes today i have swapped things round the 1970 breaker is in the garage getting broken myrtle is sat on the drive front end up in the air brake pedal pressed slightly and leaving it for a week

Post by **Dean** » Thu Oct 08, 2009 7:49 am

bigjohn wrote:and leaving it for a week

sometimes it good to leave a problem, come back later feeling fresher and in a much better state of mind.

Post by **bigjohn** » Thu Oct 08, 2009 10:47 am

its only because i needed the super unleaded for the bike to get to work and the matches to light mi fags