Brake Issue
02-10-09, 05:11 PM
#1
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Brake Issue
so i got my new EBC Greenstuffs and started installing them had a small issue with getting the backs off but got them in went to do the fronts and couldnt get the front caliper bolts off, it was already like 11ish and i had to be at work at 6am , so i put the tires back on and drove home... now when i brake the pedal is still the same fell untill i slow way down, when i come to a stop or slow down over time the brake pedal slowly sinks reducking brake pressure.... i checked for leaks and checked my fkuid level and i dont know what this could be 
02-11-09, 06:47 PM
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after much much thinking , tinkering , swearing , and angst ... i believe my master brake cylinder is starting to go bad... its not leaking anywhere buti get the sinking pedal, but as soon as i let off the pedal completely and depress it again i have full braking force and then it sinks slooooooowly to the floor .... lol anyone selling a MC in good condition without messed up threads
02-12-09, 05:35 AM
#3
Did you disconnect the lines to the rear calipers when you removed them? If so, check closely for fluid leaks at the rears.
If you did not disconnect the lines, and if there are definetly no leaks at any of the wheels or the lines, it's likely that the piston/internal seal in the master cylinder has failed and fluid is "leaking" past the seal from the front of the MC to the rear when you hold pressure on the pedal. You would not necessarily see external evidence of this condition. In this case, rebuild or replace the master cylinder and you should be good to go. Rebuilt MCs are available from several sources including Mazda and MazdaTrix.com.
If you did not disconnect the lines, and if there are definetly no leaks at any of the wheels or the lines, it's likely that the piston/internal seal in the master cylinder has failed and fluid is "leaking" past the seal from the front of the MC to the rear when you hold pressure on the pedal. You would not necessarily see external evidence of this condition. In this case, rebuild or replace the master cylinder and you should be good to go. Rebuilt MCs are available from several sources including Mazda and MazdaTrix.com.
02-12-09, 08:37 AM
#4
MECP Certified Installer
My master cylinder went bad 3 weeks ago. The signs are...
1. Pedal sinks to floor with no pressure but will then hold pressure apon re-engaging the brake pedal
2. The above happens when there is no leaks.
If there was an external leak, at least one set of wheels would stop the car unless you managed to have a leak in both sets at the same time which is highly unlikely.
1. Pedal sinks to floor with no pressure but will then hold pressure apon re-engaging the brake pedal
2. The above happens when there is no leaks.
If there was an external leak, at least one set of wheels would stop the car unless you managed to have a leak in both sets at the same time which is highly unlikely.
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