Sounds to me like air in the system, common for a fresh installation of a hydroboost.
How many miles on it since installation? Using the correct GM power steering fluid (ATF will foam)?
It took my hydroboost about 50 miles of driving to get all the air worked out of it, before that it was very "hit and miss" as far as pedal effort. Besides following Paul's filling instructions, another thing that really helps is to start the car and rev the engine to 1200-1500 or so, then apply and release the brakes slowly several dozen times. This helps get all the air out of the system. Then go drive the car and take it easy for a little while until you're sure all the air is out.
__________________
1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
|