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jonboede(at)hotmail.com
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 Posted: Sun Mar 05, 2017 2:15 pm Post subject: one brake better than another |
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If I have a stock CJ and the air line at the wheel shows the same air pressure at both sides (about 8bar/120psi) yet one side brakes GREAT and the other side is pretty puny, I have a weak bladder in that wheel, yes?
Is there an adjustment at the wheel to make a brake hold better, or is it bladder replacement time?
Thanks in advance,
jon
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PS
Joined: 08 Sep 2006
Posts: 84
Location: Texas
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| Posted: Sun Mar 05, 2017 2:20 pm Post subject: one brake better than another |
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Could be a bit of grease on the drum?
Phil
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Sun Mar 05, 2017 2:23 pm Post subject: one brake better than another |
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Bladder either leaks or it doesn't, but I'm not sure it goes weak. Could be worn pads, or worn drum, if measured air pressure is equal on both sides. Bladder is easily checked with water.
On Sun, Mar 5, 2017 at 5:19 PM Jon Boede <jonboede(at)hotmail.com (jonboede(at)hotmail.com)> wrote:
| Quote: |
If I have a stock CJ and the air line at the wheel shows the same air pressure at both sides (about 8bar/120psi) yet one side brakes GREAT and the other side is pretty puny, I have a weak bladder in that wheel, yes?
Is there an adjustment at the wheel to make a brake hold better, or is it bladder replacement time?
Thanks in advance,
jon
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dsavarese0812(at)bellsout
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| Posted: Sun Mar 05, 2017 3:03 pm Post subject: one brake better than another |
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Pull the drum and check the felt grease seal around the rear of the drum. If it's missing or broken, replace it because this is one of the culprits that causes the symptom you've described. It's caused by grease slingly out onto the brake pads. Check around the back plate and metal side plates around the brake pads to see if there is grease built up. The grease on the back plate will have brake dust all over it. The brake pads will look glazed. If there is grease outside of the rear cup where the rear felt seal fits into, you'll need to pressure wash the entire brake assembly with avgas (it dries quickly and leaves no residue). Then after it dries, scuff up the brake pads by hand with 60 grit wet/dry sand paper.
If you have to replace the rear felt seal, do it very slowly and carefully because if it stretches it will not fit tightly in the groove. If that happens and you reinstall the drum, the rear cup will cut the new felt seal and there will be grease all over the place again. I use the side of a dental tool to push the seal into the groove while holding the seal in place with my other hand to prevent it from stretching.
Hope this helps.
Dennis
From: Jon Boede <jonboede(at)hotmail.com>
To: "yak-list(at)matronics.com" <yak-list(at)matronics.com>
Sent: Sunday, March 5, 2017 5:11 PM
Subject: one brake better than another
If I have a stock CJ and the air line at the wheel shows the same air pressure at both sides (about 8bar/120psi) yet one side brakes GREAT and the other side is pretty puny, I have a weak bladder in that wheel, yes?
Is there an adjustment at the wheel to make a brake hold better, or is it bladder replacement time?
Thanks in advance,
jon
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dougsappllc(at)gmail.com
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| Posted: Mon Mar 06, 2017 11:35 am Post subject: one brake better than another |
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Jon,Dennis is correct, the problem is most likely grease on the drums ie bad wheel seals. I normally change my wheel seals at every conditional as I have the wheels off anyway repacking the bearings. Seals are in stock if you need them.
FYI (not in the manuals) a new brake drum measures 7.675 ID
to my knowledge no one has ever come up with a max wear measurement. But the min pad measurement (thickness) is listed in the Type 6 Primary Trainer Maint Manual.
At this time only the parts manuals are on the web site, in the future I plan to add the maint manuals as well.
Doug
Â
Â
On Sun, Mar 5, 2017 at 3:01 PM, A. Dennis Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:
| Quote: | Pull the drum and check the felt grease seal around the rear of the drum. If it's missing or broken, replace it because this is one of the culprits that causes the symptom you've described. It's caused by grease slingly out onto the brake pads. Check around the back plate and metal side plates around the brake pads to see if there is grease built up. The grease on the back plate will have brake dust all over it. The brake pads will look glazed. If there is grease outside of the rear cup where the rear felt seal fits into, you'll need to pressure wash the entire brake assembly with avgas (it dries quickly and leaves no residue). Then after it dries, scuff up the brake pads by hand with 60 grit wet/dry sand paper.Â
If you have to replace the rear felt seal, do it very slowly and carefully because if it stretches it will not fit tightly in the groove. If that happens and you reinstall the drum, the rear cup will cut the new felt seal and there will be grease all over the place again. I use the side of a dental tool to push the seal into the groove while holding the seal in place with my other hand to prevent it from stretching.
Hope this helps.
Dennis
From: Jon Boede <jonboede(at)hotmail.com (jonboede(at)hotmail.com)>
To: "yak-list(at)matronics.com (yak-list(at)matronics.com)" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Sent: Sunday, March 5, 2017 5:11 PM
Subject: one brake better than another
If I have a stock CJ and the air line at the wheel shows the same air pressure at both sides (about 8bar/120psi) yet one side brakes GREAT and the other side is pretty puny, I have a weak bladder in that wheel, yes?
Is there an adjustment at the wheel to make a brake hold better, or is it bladder replacement time?
Thanks in advance,
jon
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