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Hard brake pedal

My brake pedal was hard on my 1971 monte carlo so figured it was power booster ,changed it but still hard any ideas how much vac should be at the booster
any ideas

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2 Answers

You can only have whatever the engine vacuum is
at any time.
Is there vacuum to the booster check valve
& is the valve working,assuming you have the
old one or a new one with the new booster.
Does fluid flow out all 4 corners?
Are the Rubber Flex Hoses Collaped
Calipers Rusted & frozen?
Did you remove the master & clean out
the moisture from around the piston
That is where you start,then flush & on to
every component in the system, if they are
on the vehicle for many years
You do realize brake fluid gets changed every
2 years on all vehicles or you got big problems with
moisture in years to come

Posted on Jul 18, 2013

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Power brake booster need at least 15 hgs engine vacuum.if you have massive take leak or you have high lift camshaft that will cause power brake problems.make sure power brake booster hose and check valve okay the booster check valve should not be able to blow through it.hook vacuum gauge to intake manifold vacuum port then start engine do a vacuum test make sure engine got good vacuum.

Posted on Jul 18, 2013


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Posted on Jan 02, 2017

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How do u change the brake booster on a 99 Monte carlo

Hi Michelle, Im AL the owner of Big As Auto Repair.

This is an easy task with the correct tools.

First, pump the brakes 20 times with the key off. Next, remove the 2 nuts that hold the master cylinder in place. Next, pull the master cylinder back and out of the brake booster. Next, go inside the vehicle and on the brake pedal arm you see the brake booster rod attached to the brake pedal arm by a retainer clip. Next, remove the clip and slide the rod away from the pedal arm. Next, around the brake booster rod at the firewall you'll see 4 nuts you'll need to remove those 4 nuts then push the booster backward out of the firewall. Next, go back under the hood and pull the booster past the master cylinder. NOTE: You should have enough room to force the booster past the master cylinder. Replace the new booster and hook up the vacuum hose and your done. Hope this helps and please visit my auto-repair-website here:

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My brakes aren't working well. when I step on the break pedal gradually goes down to the floor. At red lights I have to put it on park. I've changed the brake pads, bled them, still don't work.....

1-change brake master cylinder it has damage o rings that losses break due to its age

2-also try to check all hoses pipes for break oil leak include under car pipes that connect master cylinder to the rear wheels

3-check pressure pipes that connect master cylinder to cylinder head


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176819.giftif.giftry this
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Notice: Do not attempt to remove the booster until pushrod is disconnected from the brake pedal.

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I have a 97 monte carlo, the brakes r gone. the onlly thing that has me stumpped is that everything with the pads and lines r good, and the reservor is full but still no brakes i also bleed them all like 5...

If the brake pedal goes to the floor you need a new mastercylinder so have that changed and bleed the brake system,that should fix your brake problem.

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Brake booster

If I understand you Question correctly you would like to know what you brake booster hooks on to? Its bolted through the fire wall by four bolts you can't see those bolts from outside in the hood. They can be seen up above the brake pedal on the inside of you vehicle . The master cylinder in mounted to the brake booster. The brake booster has a Push type rod that attached to the top of your brake pedal close to the brake light switch. Good Luck

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Buick Grand National vacuum brake conversion

^ Turbo Cars have Lots of Vaccum, Where did you ever get this idea from. I have personally converted 10+ Turbo Buicks to Vac brakes.

Make sure the check valve is okay at the booster. but it does sound like you have a bad booster.
Also, did you change the brake pedal to a Vac brake pedal?
They are not interchangeable.

Also, you should not have drilled the plenum, you can get a vaccum block to replace the plastic one on the top of the plenum with a vac brake port.

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