Thanks. I'm converting to hydroboost. I changed the combination valve and it was marginally better. The 86-87 Buick Regal turbos used a powermaster MC setup. The accumulators are not life-long parts and will inevitably lose pressure. Rather than buying a 200.00 accumulator, I'm going to convert over to Matt Sweeting's hydroboost system and use a Wilwood MC with a 1 1/8" bore.
Chris, the part number that everyone says is ideal and works well is an AC Delco 18M974. It has a 1.0" diameter bore, correct side and threads for the brake lines, and a screw on brake fluid cap. Here's a RockAuto link. I just got one for my car but have too busy to install it yet.
Chris, the part number that everyone says is ideal and works well is an AC Delco 18M974. It has a 1.0" diameter bore, correct side and threads for the brake lines, and a screw on brake fluid cap. Here's a RockAuto link. I just got one for my car but have too busy to install it yet.
Wasnt on mine, before the switch to the wilwood. If its low then its probably the Prop valve that needs to be swapped. How ever I did intsall stainless steel brake hoses.
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