Question about 2000 Pontiac Montana
Do you mean bleeding brakes or engine coolant?
The answer is no to both usually.
Since you said the plural, "screws", the assumption is you mean brakes, but you do not open more than 1 at a time ever.
To bleed brakes, you leave the engine off, and start with the furthest bleeder first, the rt, rear.
You have someone pump the pedal until you get as much pressure as you can, and then open the bleeder only until the jet of air and fluid squirts out. As it runs out, you quickly close the bleeder so that no air gets back in.
You do this until you have flushed out the old fluid and any air in the master cylinder would have been forced all the way through the tubing.
You might have to refill reservoir so that you don't run out.
If you put in a new master or wheel cylinder, it helps to bleed that alone, before you even tighten up the lines.
If there is so much air that you can't pump any pressure, then switch to the high volume method, where you leave the bleeder open, and just push you finger over it to seal on every pedal up movement, and lift your finger on ever down pedal stroke. Takes lots of yelling.
This moves air out very quickly, but still requires pressure bleeding follow up.
Also, with an older master cylinder, put a piece of 2x4 or something under the pedal, so that you do not go ALL the way to the floor. If not, you will likely rip up the master seals on any accumulated silt in the master.
Posted on Mar 12, 2011
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Posted on Jan 02, 2017
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