Question about 2006 GMC Envoy Denali

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2006 envoy Denali pulls hard right when brakes applied. changed calipers and pads no change.

Flushed and Bled system.

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Check Tire Air Pressure, Make sure they are ALL the same, Amazing what this can do on Braking.. 2nd... Suspension....3rd.. Lower Contol Arms.... Brake Lines, 4th Calipers..... Start small and Le$$...... Air is pretty Cheap! You already Bled Lines? Pads and calpers done....

Posted on Sep 01, 2017

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  • GMC Master
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Have you had the OBD codes read ? Does vehicle have ABS ? Obvious but are the tyre's ok , tread ,not worn on either edges or middle, pressure etc , Is the tracking set up correctly ?

Posted on Nov 07, 2014

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Posted on Jan 02, 2017

  • 1985 Answers

SOURCE: 1997 GMC Sierra 5.7 changed master cylinder

check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now

Posted on Dec 09, 2009

  • 524 Answers

SOURCE: Spongy brakes, anti lock disabled and brakes won't

Yes master cylinder and maybe ABS sending unit. Also is there a sound of an air leak it may also be your brake booster

Posted on May 03, 2010

kevin_getz
  • 1032 Answers

SOURCE: 2001 GMC Jimmy,left rear pads were stuck against the rotor

Either a bad caliper or wheel cylinder. In the majority of the cases, the cylinder is to blame. But if you want to be safe, replace both to cover your bases.

Posted on Apr 30, 2012

johnf1aresti
  • 1121 Answers

SOURCE: REplaaced brake pads and spped sensor on 2006 gmc sierra now brakes are spongie at times and have bled them.

DEPENDS WHAT PROCEDURE YOU USE TO REPLACE THEM.IF YOU PUSHED THE CALIPER PISTONS IN WITHOUT OPENING THE BLEEDER AND USING A **** CLOSED THE BRAKE HOSES YOU MANAGED TO SENT BACKWARDS THE FLUID INTO THE MASTER CYLINDER WHERE IS THE POSSIBILITY TO CAUSE THE SEALS ROLLING IN AND ARE NOT HOLDING PRESSURE. THE OTHER REASON IS EITHER YOU NEED TIME UNTIL THE BRAKES BED ON THE DISCS SURFACES.

Posted on Aug 31, 2012

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Vapor lock brake system on Honda Civic how do I fix vapor lock brakes 1984


Anon, have your brake system flushed and bled with good quality brake fluid. Check the attached links, video instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Bleeding the brakes just gets rid of air that is at the brake-end of the system. Sometimes a bubble of air will go up the hose some distance. There can be NO air in the line, so you will probably need to flush the brake lines completely. There are some cute hand-operated vacuum gadgets that do this fairly easily, but plan on putting several pints of fluid into the brake fluid reservoir during this process.
I added a link to a pretty good guide to most vehicles. Its the method I use. A brake shop has a better system to do this, but this is a good system for the diy crowd. And remember, you have 4 wheels, so you need to do it for all of them!
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Poor heat


It probably has an air pocket in the cooling system and needs to be bled out.

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No heat but blows cold air


to get what you describe is a problem associated with a faulty TX valve and a dirty evaporator core. The TX valve is not controlling the gas flow required by the thermostat and the dirty evaporator is allowing the build up of ice on the fins. Flushing the radiator will help with the more efficient cooling of the coolant but you have a thermostat in the coolant system that prevents water circulation until a certain temperature in the engine is reached. Your problem may be that the thermostat is stuck open or the coolant needs the air to be bled out of the system allowing the heater to get hot water.. have a radiator shop do this for you as sometimes it has to be pressure bled.

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Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

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need more info. what did you use to flush radiator? also sounds like cooling system has air trapped in it. would need to be bled. should be a bleeder valve or port installed in system.

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flush system check for debris on or around radaitor could be bum thurmostat..cloged heater core...

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1 Answer

Thermostat change


check that system has been bled, bleed screw is on top of plastic expansion tank, try back flushing the system with heating controls on full hot

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