Galimba1

I have a dumb question:
what is a brake booster?

Is the brake master cylinder the big black thingie between the firewall and proportioning valve?

Am I talking about the same part?

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B12

bahearn

The brake booster is usually a vacuum diaphragm in a large drum-like thingy. The booster is sandwiched between the master cylinder and the firewall. Proportioning valves are usually integral with the master cylinder. Older cars might have external proportioning valves; those cars I owned with that "feature" had them bolted to the firewall. Brake lines ran from the master cylinder to the proportioning valve and then to each corner of the car.

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Bruce in Houston
'94 Nissan Sentra SE-R w/ $tuff, converting to ITA
'98 Suzuki Bandit 1200S w/ $tuff
'02 Dodge Dakota SLT 4-dr tow beast, stock!