power brakes, removing the boost. - Alfa Romeo Bulletin Board & Forums
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post #1 of 3 (permalink) Old 10-20-2018, 03:26 PM Thread Starter
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power brakes, removing the boost.

So, a few months ago I realized my brake booster was leaking, probably, and probably allowing brake fluid to get into the engine combustion process. So, cheaper and simpler than replacing it, I removed it. I joined the gap in the brake lines with a simple coupler fitting, and voila: an additional cubic foot of empty space in the engine compartment. I really liked the look of the engine bay sans booster.
I bought the fitting for a couple of bucks from a well known English parts supplier and the job was done.
Well, recently I realized that my underfloor master cylinder was shot: leaking brake fluid all over the ground. So I ordered a new one. The same supplier offers both the original 22mm bore master cylinder for my car as well as a 20mm bore cylinder they say is meant for early four wheel disc brake cars that weren't originally supplied with any boost. So I oredered that one. And I am here to report that it works fine and offers a bit more of a range of pedal feel for the brake system. In short: I've removed all boost from the car and the engine compartment looks less cluttered and I am quite happy with the brakes' performance.
I might add that this is a 105 sedan with standing pedals, an underfloor master cyliner and single circuit brake line plumbing: a simple system, now simpler.
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Jonathan-
'73 GT Junior1600-gone now.
'69 Giulia 1300ti 2 liter-the honeymoon is ON.
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post #2 of 3 (permalink) Old 10-24-2018, 11:32 AM
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I run without power booster for many years,, only diff. in my car,, I run 12.19 vented disk and Porsche 2000 boxster calipers on my spider. even with all this extra caliper / brake fuild in the system, she stops really well, and brake pedal feel much better
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post #3 of 3 (permalink) Old 10-24-2018, 12:56 PM Thread Starter
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Quote:
Originally Posted by bianchi2 View Post
I run without power booster for many years,, only diff. in my car,, I run 12.19 vented disk and Porsche 2000 boxster calipers on my spider. even with all this extra caliper / brake fuild in the system, she stops really well, and brake pedal feel much better
Nice, mine is a stock single circuit brake system; only modification is Brembo calipers from an Alfa Milano on the front, nothing exotic.
The car that I think would most benefit, appearance wise, from losing the boosters under the hood, would be a U.S Market 1969 model with dual circuit brakes, standing pedals and dual boosters. I don't think a smaller bore master cylinder is available for that application, however. Still, it should work and would remove a lot of clutter from the engine bay.

Jonathan-
'73 GT Junior1600-gone now.
'69 Giulia 1300ti 2 liter-the honeymoon is ON.
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