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Location:
Brisbane
Registered:
May 2002
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Adjusting rear brake bias...
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Thu, 04 March 2004 08:20
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Atm my rear brakes lockup wayyy before my fronts (not a good thing  )...
I was planning to fit an adjustment valve just after the flexible line going to the live axle (thought it would be the easiest spot...).
Where can I get an adjustable valve (I did have a look in the yellow pages and rang a few brake places which weren't much help  )? Are there any cars that come with them from the factory, or can I say goto enzed and get one (if so what type is good?)? btw I can fabricate the fittings to match my existing lines so thats not a major problem I hope...
Cheers
Wilbo
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Location:
Finland
Registered:
November 2002
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Re: Adjusting rear brake bias...
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Thu, 04 March 2004 11:50
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In case of you having stock brakes, I'd check leaks and bleeded front brakes.
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Location:
Finland
Registered:
November 2002
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Re: Adjusting rear brake bias...
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Thu, 04 March 2004 12:02
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Hiace's and hilux's have carriage proportion valve in rear brake circuit. Does anybody know would this be modifyable for "better" purpose. How does thís valve work.
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Location:
Adelaide
Registered:
September 2003
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Re: Adjusting rear brake bias...
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Thu, 04 March 2004 21:09
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Other thing to do is to get a proportioning valve from any decent speed shop like Revolution.
Costs anywhere from $100 up.
Like Jayem said tho', are the brakes std ? What have you done to cause this imbalance if anything ?
Cheers
Michael B
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: Adjusting rear brake bias...
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Thu, 04 March 2004 22:17
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What sort of car ?
Corollas have a proportioning valve as part of the brake master cylinder assembly. Can you use a Rolla master cylinder ?
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Adjusting rear brake bias...
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Thu, 04 March 2004 22:25
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Is this a new thing?
Check front brakes firstly. Then make sure the front suspension isn't diving excessively under braking.
My first port of call when my brakes aren't working properly wouldn't be to make the ones that are working less effective!! 
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Location:
Brisbane
Registered:
May 2002
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Re: Adjusting rear brake bias...
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Fri, 05 March 2004 03:41
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I have SA63 struts (and hence hubs / calipers) in the front with MA61 kings lows (with revalved std shocks), also there isn't a brake leak.
I have a feeling that the SA63 master cyl may be bigger than the MX62 one and hence I am not pushing enough fluid to make the fronts work enough before the rears lock....if I reduce the pressure to the rears I'll be able to set the fronts up to have more of an influence...
Does the extra info help? 
Cheers
Wilbo
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Location:
Brisbane
Registered:
May 2002
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Re: Adjusting rear brake bias...
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Fri, 05 March 2004 05:49
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I think the sensible approach would be to use a M/C to match your calipers. Get an SA63 M/C if you have rear drums or MA61 M/C if you have rear discs.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Adjusting rear brake bias...
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Sat, 06 March 2004 05:38
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OK, so we're talking about a slightly modified setup. That helps a lot. 
What is the diameter of the SA63 caliper pistons vis a vis the MX62 caliper pistons? If the SA63 pistons are bigger, then you will need more pedal travel to adequately activate the front - this may result in the backs locking up as line pressure still increases as before. Like Norbie said, best bet is to replace the master cylinder with an SA63 unit. If you still have rear brake lockup issues, I'd rekit the calipers and make sure they are 100% OK. Then I might consider an adjustable proprtioning valve.
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Location:
Brisbane
Registered:
May 2002
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Re: Adjusting rear brake bias...
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Sun, 07 March 2004 02:26
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Yep yep, I'll be getting back the sa63 master cyl and putting it in during the week. Hopefully that will fix the problem as GT suggested, I'll rekit the front brakes as well later on.
Thanks for the help guys 
Cheers
Wilbo
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Location:
PNG
Registered:
June 2002
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Re: Adjusting rear brake bias...
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Mon, 08 March 2004 02:54
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PBR P8573
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