Question about GMC K1500

Power brakes feel like manual

Brakes alternate btwn working fine & feeling very stiff like manual brakes. Replace vacuum canister? Anything else that might cause this?

forgiven706 Apr 10, 2009

brake fluid has been checked.

brake fluid has been checked.

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6 Answers

Start by checking the fluid level

Posted on Apr 10, 2009

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When doing brake check air is rushing out of a diaphram on the firewall behind washer fluid resevior

Sounds like the vacuum booster is leaking (it's that large round canister behind your brake master). You will have to locate the source of the leak; if it is the vacuum booster you will have to replace it. Do the brakes feel like they're not working? That you have to press on the pedal really hard to stop?

Jan 04, 2016 | Cars & Trucks

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When applying brakes and when first start in morning truck will surge idol down. Idol is high at all times. What could this be?

Check condition and operation of idle control valve.
Also check condition of vacuum lines and brake vacuum assist hose and vacuum assist servo.

To check if you have a vacuum leak before the servo unit, first check hoses and connections, then pull off the vacuum hose to the servo unit and put your thumb on the end of it. You should feel a strong pull/vacuum. If you release your thumb then you should hear the engine revs climb, and then possibly go back to normal.
If you feel lack of vacuum, then you likely have a leak somewhere.

Another thing to check is that when you pump the brakes several times, the engine note changes and your brakes become stiff for a second or two before becoming softer again.
After you have run the engine for a few seconds and then turned it off you should be able to pump the brake pedal three times, with it being soft-ish each time until all vacuum has been spent from the servo unit, and then your brakes become stiff again. If this seems not to be the case, and they are still all the time, then you have a vacuum leak, possibly in the servo unit.

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That is the sound made by a failed servo unit - it's used to assist the brake effort and it uses the vacuum from the intake manifold - you must replace it. Since this is a critical component of the car and the slightest mistake could have severe results you should take it to a repair shop. It will cost you roughly $350: $100 for the part, $250 for the labor.

Aug 23, 2011 | 1997 Chevrolet K1500

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I have a 2005 Altima. Lately the weather has been below 0 and my brakes do not work until the car has had time to warm up. This problem is not consistent. They are not packed with ice and the pads are...

its condensation that is freezing up in the vacuum line that supplies the power brake booster.i have run into this before and if i remember correctly nissan manufactured a counter measure part for this complaint.contact local dealer parts dept. they should be familiar with this part.relatively simple to replace.

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more than likely it is a vacuum leak in the booster

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could possibly be vacuum assist check valve is defective and you are feeling the engine vacuum pulsations. Easy ck, Inexpensive, easy replace. Good luck. If you will, let me know. please

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1 Answer

Power brakes feel stiff like manual

Your having a problem with the vacuum booster,check the hose connection at the booster,if the hose is fine the diaphram in the booster is leaking and about to fail.

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1992 SUZUKI SIDEKICK AUTOMATIC HAS BRAKES LOCKING UP ON RANDOM WHEELS WHEN TURNED OFF AFTER SHORT DRIVE. REPLACED CALIPERS, MASTER CYLINDER, BRAKE LINES, FRONT PADS, BACK ONES FINE. PEDAL IS VERY HARD...

Try the following to confirm if is the servo unit .( engine off,pump few times the brake pedal to become stiff.Keeping pressed the pedal start the engine and if servo is working you will feel the pedal slightly goes down.If not will not move at all-remain stiff.) Also if you do have the check valve close to servo not working you can realize it by the engine idle ( erratic ) and the servo not working.The other possibility if the vehicle is fitted,the ABS unit itself.

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your power brake booster needs replaced ,it work off engine vacuum and when the seal inside leak there is no power assist for the brakes

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There is a vacuum check valve to the brake booster. This will be the likely fault.

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Related Questions:

When doing brake check air is rushing out of a diaphram on the firewall behind washer fluid resevior

When applying brakes and when first start in morning truck will surge idol down. Idol is high at all times. What could this be?

The brakes r really stiff and as you step on the brake pedal you hear what sounds like a huge air leak come from under the dash 1997 chevrolet 1500 4x4

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Power brakes feel stiff like manual

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Power brakes feel like manual

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Anonymous

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Related Questions:

When doing brake check air is rushing out of a diaphram on the firewall behind washer fluid resevior

When applying brakes and when first start in morning truck will surge idol down. Idol is high at all times. What could this be?

The brakes r really stiff and as you step on the brake pedal you hear what sounds like a huge air leak come from under the dash 1997 chevrolet 1500 4x4

I have a 2005 Altima. Lately the weather has been below 0 and my brakes do not work until the car has had time to warm up. This problem is not consistent. They are not packed with ice and the pads are...

I press on the brakes and it feels like they are manual and the vehicles wants to stall ... I was told it may be the vacuum hose on the master cylinder

Stuttering brake pedal

Power brakes feel stiff like manual

1992 SUZUKI SIDEKICK AUTOMATIC HAS BRAKES LOCKING UP ON RANDOM WHEELS WHEN TURNED OFF AFTER SHORT DRIVE. REPLACED CALIPERS, MASTER CYLINDER, BRAKE LINES, FRONT PADS, BACK ONES FINE. PEDAL IS VERY HARD...

93 dodge dynasty brake pedal stiff wont apply brakes

Mazda MPV 2002 Power brakes lose power with a cold engine

Not finding what you are looking for?

Cars & Trucks

When doing brake check air is rushing out of a diaphram on the firewall behind washer fluid resevior

Open Questions:

What is the the torque sequence for intake manifold?

How can I replace rear air suspension?

Why doesn't it start? I kooke the cable up backward on my 16 black widow gmc

SLT 4.2l 2wd. Where do the two vacuum lines go from the top of transmission?

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