Brake booster
April 16th, 2018, 07:16 AM
#2
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,289
Frankly, the manual disc brakes that came stock in my 70 W-30 work fine. If you MUST have power, use a hydroboost.
April 16th, 2018, 09:02 AM
#3
Registered User
Thread Starter
Join Date: Apr 2018
Location: Oakland California
Posts: 21
If you are doing this because you want to clear tall valve covers, don't. A 7" booster is next to worthless. There are only two things that control the amount of boost from a power brake booster - air pressure and booster diameter. Unless you are driving up Pikes's Peak, air pressure is pretty much the same. That means that the booster diaphragm diameter directly governs boost. Stock booster is an 11" - that's about 95 sq in of diaphragm area. A 7" booster has about 38 sq in of diaphragm area, so you'll only get about 40% of the assist as you would with stock. Even a dual diaphragm 7" booster only gives you about 80% of stock. Don't waste your time.
Frankly, the manual disc brakes that came stock in my 70 W-30 work fine. If you MUST have power, use a hydroboost.
Frankly, the manual disc brakes that came stock in my 70 W-30 work fine. If you MUST have power, use a hydroboost.
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