Really hard pedal, shop replaced booster w rebuilt booster, no better, replaced master cylinder, no better, replaced hard line across rear axle, better. Every time I mash brakes hard, brake warning light comes on.
Brakes not great, just OK.
I take car to Chevelle expert who I trust. I ask him to change proportioning valve on frame while he’s doing other work.
He says bad booster. He says rebuilt boosters very problematic. He says has replaced 3 rebuilt on same car, only uses new now.
Any comments ?
Is there a way to check my booster ?