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Front brakes holding up? decrease MPG  RSS feed
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mngoat

Joined: 16/12/2009 12:46:19
Messages: 9
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GDE, on another post you stated "We noticed significant differences in fuel economy on our two KJs in the past and it stemmed from the front brakes. The support pins that hold the calipers in place tend to get build-up inside the little rubber protectors and this prevented the calipers from finding a neutral position. After we took the calipers off, cleaned the support pin and then re-lubricated with (CRC synthetic Brake & Caliper Grease) the fuel economy came back up. This may be the issue with your father's KJ."


I have been trying to track down why i have lost more than the normal drop in MPG with winter fuel. Would the reason above cause the front brake rotors to get hot even with minimal use? Mine seem like they get really hot(can't hardly touch ) and the rears are cool even with minimal use. I've also notice this past winter that the front ABS seemed to be real sensitive(coming on all the time when i touched the brakes). Would this be a sysmtom of sticky calipers? Thanks
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 372
Location: Southeast Michigan
Sorry for the late response...hopefully the vehicle is fixed already. The brakes on the KJ are biased towards the front. The high temps do indicate sticky caliper pins or some sort of residual pressure in the brake lines. Definitely check the front brakes, does the brake pedal always feel the same or does the first press of the pedal sometimes feel mushy? You may need to bleed the front brakes as well. Let us know how it worked out for you. Thanks
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WXman
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Joined: 29/01/2010 14:53:49
Messages: 27
Location: Kentucky
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Since our KJs have 4-wheel ABS...is there a specific procedure to follow when bleeding? Or do we just bleed them like we've done on cars for decades?

'05 Liberty CRD Limited
Factory Off-Road Package
Daystar spacer lift/Conduit washers
Skyjacker H7088s in the rear
Renegade wheels
255/70-16 General Grabber AT2s
GDE HOT Tune
EHM
No clutch fan
"Euro" TC
mngoat

Joined: 16/12/2009 12:46:19
Messages: 9
Offline
GreenDieselEngineering wrote:Sorry for the late response...hopefully the vehicle is fixed already. The brakes on the KJ are biased towards the front. The high temps do indicate sticky caliper pins or some sort of residual pressure in the brake lines. Definitely check the front brakes, does the brake pedal always feel the same or does the first press of the pedal sometimes feel mushy? You may need to bleed the front brakes as well. Let us know how it worked out for you. Thanks




Actually I'm still working on it. I have had the caliper pins stick. I swapped them out with a new set of pins and rubber from napa. I used the brakes grease from napa( it is in the little blue package at the front counter, It is a synthetic grease http://www.napaonline.com/Search/Detail.aspx?R=BK_7653072_0006462455 ). Upon install the calipers worked great but after about a week the pins (top ones only) locked up. Got them out and it was the little black rubber that slides over the pin that was holding them up. I had to hammer them out. It was almost like the grease i used caused the rubber to swell. I don't know. Anyway i just decided to changed out both front calipers this weekend and used a different grease. I am watching the top pins carefully.
 
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