Mystery rear brake cylinder

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timwilks13
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Mystery rear brake cylinder

Post by timwilks13 » Tue Apr 23, 2013 3:09 pm

Hey guys, just done a basic brake over haul, new brake cylinders, shoes etc. But in the process i came across a random brake thing that im not sure what it does nor can i find anything out about it. Basically if you follow the brake lines from the master cylinder, 2 lines run off to each of the front brakes and a single line runs off to the rear wheels, however half way down the rear brake line there is a single brake cylinder/reservoir/something im not sure of. Can anyone tell me a. what it is, and b.whats it for? it has a single line in, and a single line out so as far as im concerned its borderline pointless....?!
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Last edited by timwilks13 on Tue Apr 23, 2013 3:22 pm, edited 1 time in total.
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dazerede
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Re: Mystery rear brake cylinder

Post by dazerede » Tue Apr 23, 2013 3:16 pm

Umm can't see what ur on about with all that mud there

Ye mine has that not sure what's the purpose of it
Mine looks a lot cleaner than urs
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Jordi
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Re: Mystery rear brake cylinder

Post by Jordi » Tue Apr 23, 2013 4:14 pm

Some kind of bias valve/compensator type thingy i believe.
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Re: Mystery rear brake cylinder

Post by suzukisteve » Tue Apr 23, 2013 4:46 pm

im with jordi, looks like the load valve bud
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Darrell
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Re: Mystery rear brake cylinder

Post by Darrell » Tue Apr 23, 2013 7:00 pm

It's the D.S.P Valve

























What ever the hell that is :hmm:
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Re: Mystery rear brake cylinder

Post by ROBBIE » Tue Apr 23, 2013 7:33 pm

Darrell wrote:It's the D.S.P Valve

























What ever the hell that is :hmm:
Digital Signal Processor using valves which give excellent sound quality hence why a lot of companies have started using them again. Wouldn't want one under a muddy SJ tho
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Jordi
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Re: Mystery rear brake cylinder

Post by Jordi » Tue Apr 23, 2013 7:37 pm

ROBBIE wrote:
Darrell wrote:It's the D.S.P Valve

























What ever the hell that is :hmm:
Digital Signal Processor
Digital. I dunno Robbie. If its digital mine is definately broken.
1988 Samurai - Truck Cab & Tray Back - 1.6 8v & HIF44 - Snorkel - Stack Exhaust - PAS, YJs & 33s - Trussed, Gusseted & Pumpkin Capped Axles - 4.3 R&Ps - 4.16 T/Box - Rear Air Locker - Full Float Back Axle & Discs - RCV Front Shafts - X-Eng Handbrake - Custom Fuel Tank

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Darrell
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Re: Mystery rear brake cylinder

Post by Darrell » Tue Apr 23, 2013 10:19 pm

Well I had to find out what it is, so
It's basically a valve to stop the rear end from locking up under heavy braking.
As far as I can find out its fitted to some sj410's and the LWB sj413.
Its a "Deceleration Sensing Proportioning Valve"
If your sad enough like me and want to know more http://www.google.co.uk/patents/US4194792
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Re: Mystery rear brake cylinder

Post by Edweird » Tue Apr 23, 2013 11:06 pm

In leyman's terms: It's like a REAAALLY primitive ABS for the rear axle.

In Yeller-belly: It's a fing whot keeps yer back whirlies from stoppin' when yer slam yer anchors on.
Last edited by Edweird on Wed Apr 24, 2013 1:44 am, edited 1 time in total.
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Re: Mystery rear brake cylinder

Post by Pugsley » Tue Apr 23, 2013 11:47 pm

Important that when bleeding the rear brakes that you bleed this valve also - if you clean it up I'm sure you will find that it has a bleed valve. Be extremely careful when undoing the bleed valve as it is pretty weak and it will be corroded in - from memory it's an 8 mm spanner size. I had to completely remove mine and apply some "scientific" heat to to the bleed valve to undo it and even I nearly snapped it off. The problem with heating it is that the valve inner components have rubber seals which can be destroyed using a blow torch - I stripped the innards out before heating it and it's just as well I did as it was siezed solid.

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