Question about 2003 GMC Sierra 1500

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Service break booster on information panel came on and I don't know if this means I should just change the booster. Is it a sensor perhaps etc ? The truck is a base model gmc sierra 1500 4 x 4

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You have hydralic brake system.control by the power steering pump.check power steering pump fluid if low add.if fluid level good have the dealership check it out.your booster or power steering is going bad.

Posted on Jun 14, 2009

  • danskuce
    danskuce Nov 08, 2012

    Power steering Not related to brakes


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Has the instrument cluster been replaced, i have seen incorrect software programmed into it causing concern

Posted on Jun 19, 2009


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1 Answer

I have a code c1100

DTC C1100 00: Brake Booster Vacuum Sensor Performance .
Do you know what the brake booster is ?
Circuit/System Description
The electronic brake control module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. The brake booster vacuum sensor converts the change in vacuum levels in the brake booster into a voltage signal. This signal is sent to the EBCM. The voltage signal ranges, from 0.13 to 3.30 volts depending on vacuum levels. The low reference is the return side of the sensor to ground.
Conditions for Setting the DTC
Voltage at the brake booster sensor signal output to the EBCM falls outside the 0.13 to 3.30 volts range for more than 200 milliseconds.

The power 5-volts reference is shorted to ground or battery positive.

Action Taken When the DTC Sets
The red BRAKE Warning indicator turns ON.
Circuit/System Verification
DTC C1100 will set as result of power brake booster vacuum sensor or circuit failure, test for power and ground circuits to the EBCM.
Repair the power or ground circuits.

do you know what

Apr 19, 2016 | 2007 Chevrolet Tahoe

1 Answer

Break system

When you say brake system do you mean rotors and pads or everything including the brake booster, sensors, abs. If you want a good set up go with brembo.

Apr 27, 2013 | 2010 Dodge Avenger SXT

1 Answer

2000 Chevy K3500 No Breaks. Bled breaks, not losing fluid, ABS and break lights on. Hydraulic booster system. makes hissing sound when breaks applied???

I think I would get the body computer scanned for trouble codes and find out why the ABS warning light is on first.
The hissing noise usually means the booster is leaking vac but if the booster was faulty the brake pedal would be hard to push.

Feb 09, 2013 | 1998 Chevrolet Blazer

1 Answer

No leaks on the hose, but leaks from the booster that think that looks like a black ball, and no pressure break peddle goes all the way down..... what would i have to buy and change and can i do the work...

if the pedal is going all the way down I doubt its the booster but instead the master cylinder, the leak you see is it where the master cylinder connects to the booster ? a bad booster would mean you have no pedal assist,, which would feel like trying to stop a freight train with your brake pedal, if you know about brake systems then you could probably change the master cylinder, all it is for the swap is remove the old and install the new, the trick is in knowing how to bleed the system, and bench bleed the master cylinder,, and you don't want to be messing with the brakes if your not sure how to do this repair,

Aug 26, 2011 | Buick Park Avenue Cars & Trucks

2 Answers

I have a p1135 code does that mean it the o2 sensor cause i have change the mass air sensor

Code P1135 is a vehicle specific code for selected Toyota vehicles - it really helps to know what car you are working on...Year, Make, Model, Engine Size, Automatic or Manual Transmission, etc. There may be Technical Service Bulletins that apply to your vehicle that cover things like reprogramming the engine controller to correct this code, etc. Nobody can give you that information if they don't know what kind of vehicle we are talking about.

In general, the code description for code P1135 is "Air Fuel Ratio Sensor Circuit (California Emissions )"
The possible causes are
1. Open or shorted Air Fuel Ratio Sensor (AF) circuit
2. Faulty AF sensor
3 AF sensor heater or heater circuit shorted or open
4. Engine Control Module (ECM) Fault

The Mass Airflow Sensor (MAF) cannot cause this code - this is a "CIRCUIT" code, not a not a "LEAN" or "RICH" Oxygen Sensor (or AF Sensor) code. The MAF can only cause lean or rich codes.

Most of the time, this code is caused by the sensor itself, however, as I mentioned earlier, there are Technical Service Bulletins for several Toyotas that involve reprogramming of the Engine Computer.

Mar 26, 2011 | Toyota Pickup Cars & Trucks

1 Answer

How to change a power brake booster on a 1995 jeep cherokee sport with 4 cylinder motor

mcdevito75 Here, This is a shop job unless you are really familiar with your car, jeep. First you"d have to remove the master cylinder or at least move it without damageing the lines, then under the dash disconect the booster from the brake pedal and firewall being carefull nopt to break the bulb at the end of the booster. Boosters only come new and not re-built you could get a booster at a junk yard. To test your brake booster, with the engine off pump the brake pedal till it"s rock hard, NOW with your foot on the brake start the engine and feel the brake pedal sink just a bit. NOW turn the engine off, you should still have 2--3 applications of the power brake left, if you have all this, you don"t need a brake booster.

Jun 17, 2010 | 1995 Jeep Cherokee

1 Answer

I had a low brake pedal so i changed the master cylinder but after the change pedal is higher but seems to be hard to push like i have no vacume fo the booster

did you hook the back blast valve back up to the booster mon........ also check the plastic valve in the line to the booster to make sure its working if that don;t fix it then either you have a bad booster or you put the wrong master cylinder on it cause the one for standard breaks? the hole in the end of the master cylinder isnt as deep and the one for power breaks

Jan 18, 2010 | 2003 Volvo XC90

1 Answer

2003 hyundai accent back door locks are jammed

Seems to me those locks are rusted/oxidized (frozen). You'll need to replace them (if you know how).. If you don't know how, perhaps you should contact a Hyundai Technician. Anyway, they're called "Door Lock/Unlock Actuators" If you want to repair them yourself, it's really a messy task to 'un-oxidize' those linkages without breaking them... best replace them. If you want to do it yourself, Go to and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

Jun 13, 2009 | 2003 Hyundai Accent

1 Answer

2002 tahoe breaks lock up during driving

i would check front and rear brakes if rears are drum brakes i would inspect springs and hardware making sure everthing is conected and in place also make sure they are adjusted properly in the front and if rear disc i would make sure to grease caliper slides these allow caliper to move and its important that all moving brake parts are free push caliper pistons in alittle to see if they are sized or not booster is ok and most of the time when master goes it will leak where it meets booster and you will have a low brake pedal or no brakes

Mar 31, 2009 | 2002 Chevrolet Tahoe

1 Answer

Brakes brake pedal is hard to push

Chk. to see if you got vacume to break booster, If there is than i would say the booster is bad. When you have to push hard on break peddel means either the booster is bad or there is no vacume to booster. I really don't understand the secound part of your question, Do you mean there are no bleeders on the rear breaks? or you can't get fluid to bleeders in the rear? If you can't get any fluid to the rear breaks, you could have a master cyl. problem too.

Mar 30, 2009 | 1986 Lincoln Mark VII

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