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targis58
Samba Member
Joined: July 11, 2006
Posts: 539
Location: sunnyvale,ca
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 Posted: Thu May 06, 2010 5:21 pm Post subject: rear brake sylinder leak.. what have I done wrong? |
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rear brake sylinders were fine(no leak) when I opened the drums. Once I disassembled, ajusted, and put everything back in, one of the piston in the rear synder is leaking pretty badly when I depress the brake pedal.
What have I missed here?
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90 westy 2wd w/ TBD |
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getset
Samba Member
Joined: March 07, 2005
Posts: 437
Location: PNW | OLY
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| Posted: Thu May 06, 2010 7:50 pm Post subject: |
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There is most likely something wrong with the rubber boots on either end of the wheel cylinder. They have ridges that fit in the groove of the cylinder and piston there is a possibility that during reassembly one of the these popped off causing the leak. Either that or you accidentally tore one when putting the brake assembly back together.
That is my guess anyway. you will have to pull the drum and check. Should be evident once you have a look. |
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targis58
Samba Member
Joined: July 11, 2006
Posts: 539
Location: sunnyvale,ca
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| Posted: Thu May 06, 2010 8:00 pm Post subject: |
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Exactly.
I pulled the sylinder out and disassembled it. The rubber inside was torn. It must ve happened while I was trying to put the shoe against the sylinder. I did try to force it to go together.
Thanks
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90 westy 2wd w/ TBD |
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AtlasShrugged
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Joined: October 30, 2008
Posts: 1605
Location: Decatur, Ga. USA
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| Posted: Fri May 07, 2010 5:19 am Post subject: |
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| Unless you recently put new ones on, be sure and replace the wheel cylinders on both sides when you make your repair. They are inexpensive and the work involved is the only pain. Having one new and the other several years old or more could be asking for trouble. |
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MarkWard
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Joined: February 09, 2005
Posts: 17155
Location: Retired South Florida
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| Posted: Fri May 07, 2010 6:23 am Post subject: |
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To clear up any confusion to someone reading this thread later. The outer boots, the ones you see, are to prevent dust, dirt and moisture from getting into the wheel cylinder. If you have brake fluid behind a dust boot, the wheel cylinder has already failed. Yes it is always best to replace them in axle pairs.
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targis58
Samba Member
Joined: July 11, 2006
Posts: 539
Location: sunnyvale,ca
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| Posted: Fri May 07, 2010 8:03 am Post subject: |
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| rsxsr wrote: |
| To clear up any confusion to someone reading this thread later. The outer boots, the ones you see, are to prevent dust, dirt and moisture from getting into the wheel cylinder. If you have brake fluid behind a dust boot, the wheel cylinder has already failed. Yes it is always best to replace them in axle pairs. |
Thanks. Good info. When I pressed on to the dust cover, it squirted the oil out. It was already bad then. I am going to order the new hardware as well and replace everything while at it. At least my rear brakes are self adjusting fine. 
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90 westy 2wd w/ TBD |
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Zero419
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Joined: January 11, 2008
Posts: 2160
Location: PA
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| Posted: Fri May 07, 2010 8:07 am Post subject: |
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Might as well get some flexlines while your in there...
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1987 Westy Auto Bostig 2.0 Ztec |
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