Question about 2003 GMC Yukon XL

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Trying bleed the brake after a front caliper and front pads changed, all air is out of the system, but we don't have a good brake pedal, Please respond asap!!!!!!!

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You will need:

A couple 8oz bottles of brake fluid.

A box wrench that fits the bleeder bolt.

A piece of clear plastic tubing (aquarium tubing is fine, and it

Posted on Apr 07, 2011

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1 dont be upset got to ask seen this done many times before
are the bleeder screws at the top of callipers if not the right
is on the left and vise versa calipers bleeders must be at top
2 if calipers are ok try to gravity bleed them open furthess bleeder in front system
remove filler cap and let flow out a good 60 seconds re tighten then go to next
and do the same
3 if still no pedal there might be a leak somwear or master cylinder is bypassing
if they worked fine before the brake job was done somethings not on right
4 is there any leaks at the rear

Posted on Apr 07, 2011

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U pushed pedal down to far when bleeding, now u have a bad seal at master cylinder.the pushrod overextended. did u deplete brake before changing caliper and pads ? anti lock vehicles have to be depleted of all pressure before beginning work. have u bled all brakes? air could have been pushed to rear.

Posted on Apr 07, 2011

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1 Answer

Brake pedal soft after changing pads and bleeding brakes


You will need to bleed the brake system. I would start with the rear brakes lines and work towards the front.You must have key off engine off when bleeding brakes, apply pressure on brake pedal 10 times and hold. The brake line is now ready to be open. Open and let the stream of fluid come out and close the line tight. Then release brake pedal once bleeder screw is close. This procedure must be repeated twice front and back. After, brakes have been bleed pump the brake pedal before putting in drive.
Note: Don't let the resevoir run low on brake fluid. This will cause air bubbles to accumulate on the brake system. Always top off before opening bleeder screw.

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How do i replace the front calipers on my 2001 4runner,done lots of pad and rotor replacement but never any front calipers?thx.


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I replaced front and back brakes on my 1996 1500 Chev Suburban. Bled the brakes starting at the farthest line. The pedal is soft and travels too far. Does not seem to stop very good. What is the...


it sounds like there is still air in the brake system that has not been removed.you don`t say if you replaced the brake pads and shoes(in which case you shouldn`t need to bleed)or you replaced a brake line(s) or wheel cylinder or caliper.you will have to keep bleeding the brakes all 4 wheels(trucks don`t use bi-directional braking meaning right rear brakes with left front and so on).bleed both rear brakes then bleed both front brakes,was this problem there before you replaced the brakes(soft pedal noticed) and this is why you changed the brakes or the pedal was soft and the brakes needed changing.its possible that the master cylinder has an internal leak and may need replacing.

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1997 Jeep Grand Cherokee Brake Problem. Brake Pedal Falls To The Floor. Calipers were replaced twice,master cylinder,brake hoses and pads. Systemm has been bleed numerous times - no air but the brake...


This may sound dum but its been done a few times and is a simple mistake , the bleeder screw is up top, with the caliper on the bleeder screw should be up top, if not then calipers are on the wrong side, it sounds like air in the system, also you pumped the pedal up to push out the piston so pads hit rotor after bleeding,i dont see anything else, if the pedal is good with pinched lines at caliper then it got to be calipers are wrong or on the wrong side and the bleeder is not atop caliper,also you bleed the rear also? these trucks and cars use left caliper and rt rear on one system of the master and rt front and left rear on one side, let me know about the caliper, heres a picture to show you what i mean. hope this helpsjohnjohn2_23.jpg

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1 Answer

I have a 2005 titan and i changed my front brake pads and bleed to 2 front calipers and the brake pedal is still soft . i took the calipers off and push the pistons back in fluid came out of the top of the...


There is no need to bleed the system unless you opened the lines or the reservoir ran dry. The pedal should stiffen up once the pads have reseated. If you do have to bleed, leave the top on or you will spill fluid. To bleed, have one person pump up the pedal and hold it down while you open and close the bleeder. They should not release the pedal until the bleeder is closed. Do this repeatedly until no air bubbles come out. Am I making sense?

Sep 26, 2010 | 2005 Nissan Titan

1 Answer

My chevy lumina and when you go down the road the brakes start to rub and can smell them burning pressure builds up in the brakes the more you drive


Sounds like a typical frozen brake caliper situation.
First thing to do is not drive this car any further as you may have severe problems on the road, using either a car lift or a floor jack and safety jack supports, locate by eye and/or by smell which wheel is burning and smoking,example: If the passenger front brake is the one at fault, you will need to replace "both front brake pads, possibly both front disc brake rotors and if the disc brake caliper has a frozen piston on the right front, both front disc brake calipers(which can be simply determined by trying to squeeze the piston back with a large clamp or special tool that is made specifically for this and is easily obtained and easy to use from any parts store(Auto Zone or the like ) may even lend you some of the tools you need if you buy the parts from them...how cool is that?
If the caliper piston won't press back into its bore, it needs to be replaced and always replace both calipers not one side, the same with replacing the brake pads, example: right front caliper and brake pads are defective, replace also the left front caliper and pads as well, to allow for a proper stopping action, be sure to replace the disc brake rotors when changing brake pads as well.
Also while inspecting the vehicles brake system check the brake hoses(Heavy rubber lines that connect from a metal brake connector to the back side of your brake caliper, each wheels brake caliper or (wheel cylinder,used on the older drum brake systems) has a brake hose) look for cracks and leaks in the hoses, replace as needed.
Be certain to also check all four wheel disc brakes for signs of wear, if the brake pad (asbestos material mounted on the metal brake pad backing plate, known as the "web") looks about the thickness of the metal "web" or thinner, replace the disc pads and or drum brake pads along with the rotors(dish looking object that disc brake pads actually squeeze against to stop the car).

BLEEDING or PURGING AIR FROM THE HYDRAULIC SYSTEM:

The bleeding or purging of air from the hydraulic system in any brake system requires quite a bit of knowledge and patience, however, and if purging is needed ,two persons to do the job correctly.
First be certain the vehicle is jacked off the ground and secured on jack stands, start bleeding the furthest away brake from the master cylinder which is located under the hood on the drivers side firewall and be sure you have filled the master cylinder up with the proper recommended DOT (probably DOT lll or lV) brake fluid. Put the cover on the master cylinder once you have it filled and be aware to check the fluid level after each bleeding is done.
Step1:
After all your brake replacement work is done, fill master Cyl. and secure it's cover, be sure car is safely secured with jack stands , starting with both rear brakes/wheels off the ground(furthest from master cyl) have second person pumping(pushing the brake pedal up and down without letting off the pedal) this action forces any air in the hydraulic line to find its way out.
Pump pedal this way at least four to five pumps and hold the pedal down to the floor or as far as you can push it, don't let off the pedal, the person bleeding the passenger side rear disc brake caliper (furthest brake purge valve away from the master cylinder) will say "Ok, holld the pedal down", of course after he/she first told you to "Pump it up".
Step 2:
While the pedal is held tighly down the person bleeding will have located on the back of the disc brake caliper assembly a small(1/4 or 5/16 typical hex size) bleeder valve.
The valve must be opened with the proper size box wrench allowing the air to purge out(installing a small rubber hose on the end of the bleeder valve nipple approx. 1 1/2 ft. long and having it suspended and submerged into a clear plastic jar that is 3/4 full of new brake fluid in it) you will see and hear the air release and if using the jar system(I totally recommend) you will see the air bubbles escaping out of the submerged hose. Doing it this way also will not allow air to re enter the system if the person pumping the pedal should happen to release the pedal before you tell them to. Close the bleeder valve.
Step 3: Repeat the process on each wheel at least four times or until you see no visible signs of air coming out, remember, wrench and hose (secured tightly on bleeder valve nipple and submerged in fluid) "Pump it up,(3-4 pumps)" Hold it Down", open the bleeder valve and repeat this process until each wheel has clear fluid flowing out of the bleeder purge valves. Be certain all lines and valves are closed tight.
When the system is purged of all air, the pedal will be as good as the way it was when new, dont forget with all "Power" brake systems, the brake pedals will never be all the way up to the top when pressing the pedal down, it may also feel like it is low, but after a good road test you will see that the static feel of the pedal is not the same as the actual stopping feel of the pedal on the roadway driving.
The only time the feel of the brake pedal should be questioned is if it sinks to the floor, or if you can litterally pump the pedal up a few times and on the second or third static pump(static meaning the car is not moving) the pedal is actually getting higher off the floor, then you may have air still in the system.
If so repeat all the prceedures again being sure you have the master cylinder full of fluid before after and during the entire process.


This is a hard, dirty, and lengthy job, doing it yourself will save you hundreds of dollars, but if you do not work with safety being your primary concern, all the money saved is worthless.
Please be sure to wear the proper eye/hand protection, and wear a painters mask as well.
Happy Motoring!!

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3 Answers

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hi from the uk have had this problem on a customers car b4 who had replaced frot calipers and pads and pedal went to floor on inspection of caliper i found that the steel spring clip that fits into two holes in the front face of caliper and must also locate behind the caliper carrierbehind two lugs was fitted incorrectly it had been fitted behind the outer pad resulting in when brake pedal off ?the caliper being floating type as it is known because it is fixed by two screw pins/bolts and moves on these pins/bolts as pads wear ? what happens is the spring fitted wrongly ? actually pushes against the outer pad and as a result the caliper piston is pushed back into its cylinder slightly as it moves on the locating pins/bolts resulting in pedal going to floor on 1st application but if pumped ? some brake pedal force is felt but is lost again when pedal released ? so try this ? remove the steel clips from both front calipers that retain caliper to carriers then press brake/pump pedal ? if as suggested above works? your pedal should pump up and remain ok when you release and still be firm when re applied ? all above is what i found on ford ford but many other models use similar calipers and spring locating recheck how this spring should locate hope this helps ? good luck

Mar 19, 2010 | 2001 Kia Sportage

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TRYING TO CHANGE MY FRONT BRAKE PADS ON MY GS300 LEXUS 1993. MY QUESTION IS WHEN I TAKE RIM OFF AND LOOSEN UP THE CALIPER TO RELEASE BRAKE PADS AFTER RE-INSTALLING I SHOULDN'T HAVE TO BLEED THE BRAKES LIKE...


Replacing brake pads involves pushing the pistons all the way back into the the caliper. This will force fluid up into the master cylinder. Sometimes it also allows some air to get past the piston seal and cause 'soft' pedal. In this case bleeding is required. Anyway the brake fliud should be completely changed by pressure bleeding at this time.

Mar 19, 2010 | 1994 Lexus GS 300

2 Answers

How do I bleed the front brakes on a 2004 audi a4 quattro?


For front brake pads replacement you need only usually wrench set, inclusive 7 mm allen key also. But for rear brake pads replacement you need obligatory a special caliper piston pressing tool, in order to press back rear caliper piston with parking brake automatic adjustment!!! For front brake pads. First you must verify yours front brake disc diameter: 280 mm or 288 mm. (On my car y have 288 mm). After that you can buy the brake pads (with wear sensor). For change front brake pads you must raise vehicle, remove wheels, extract the retaining spring of the caliper, and remove the caliper as follow: 1. Do not disconnect the brake hose from the caliper, and do not allow the caliper to hang by the brake hose! 2. Remove top and bottom caps (on back side of the caliper) for access to guide pins, then unbolt and remove them from the brake carrier. Remove the caliper. 3. Now you must thoroughly clean the brake calipers (free of grease). 4. Remove outer brake pad from brake carrier. 5. Pull inner brake pad out of brake caliper piston. 6. Check up the brake fluid level on the reservor, and emptying if neccessary! 7. Push piston back into brake caliper housing. 8. Install inner brake pad (with expanding spring) in brake caliper piston. (Arrow marked on pad - if exist, must point in direction of brake disc rotation when vehicle is moving forward). 9. Install outer brake pad into brake carrier. 10. Bolt brake caliper housing to brake carrier using two guide pins. Tightening torque is 25 Nm. 11. Install both caps. 12. Insert retaining spring into brake caliper housing. Important: Depress the brake pedal firmly several times while the car is stationary so that the brake pads adjust to their normal operating positions!!! Check brake fluid level and top up if neccessary!!!

Oct 01, 2009 | 2004 Audi A4

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