14 years ago in PONTIAC
i switched from a single mc to a dual mc on my 63 bonneville still has front and rear drum brakes. i replaced all wheel cylinders or rebuilt them, put all new lines on, all new brake shoes,bleed the mc and lines i have pedal but can not build up pressure. i have to stand on pedal to get car to stop. any suggestions would be greatly appreciated
Answers (1)
The diameter of the piston inside the dual master cylinder may be much smaller than the single line you took off.
# 2 the actuating rod may not be adjusted properyly allowing too much free play before it engages the piston.
Do you know what this M/C is for,if it was for power assist that could be another thing to check for ,it should have been for manual brakes if thats what you started with.
Sources: Check with these guys if you need more help.
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