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Re: 1994 GS 300 Brake goes all the way down
Did you make sure that the brake booster piston rod was adjusted for the new master cylinder? Per the Haynes manual: - Adjust the length of the brake booster push rod as follows:
- Set the measuring tool (09737-00010 or equivalent) on the master cylinder with the gasket and lower the pin of the tool until it lightly contacts the piston.
- Turn the measuring tool upside-down and position it onto the booster.
- Measure the clearance between the booster push rod and the pin head of the tool. There must be zero clearance. To obtain zero clearance, adjust the push rod length until the push rod light contacts the head of the pin.
- Before installing the master cylinder, make sure that the UP mark is in the correct position. Install the master cylinder over the mounting studs and tighten the three nuts to 9 ft. lbs. (13 Nm).
A plunge gauge or micrometer can be used to measure the piston depth.
Another option might be a leak in your brake booster diaphragm.
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Current Garage:
2009 Honda CR-V EX
2006 Mazda 3i
2004 Chevrolet Silverado 2500HD
2003 GMC Envoy XL
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Vehicle History:
2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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