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Location:
Adelaide
Registered:
July 2002
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AE82 more brake boost?
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Tue, 20 July 2004 05:38
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Hi, just wondering how i can go about getting more braking power
because im really having to slam the brakes on to get the thing to stop
i've driven a few other cars, and their brakes feel much better, to the point
where i have to learn not to hit them so hard otherwise the thing locks up,
so basically im wondering if i can use a brake booster from another car to get a bit more assistance
when braking. At the momemnt i've got drums at the rear and ae82 twin cam rotors and calipers at the front
i've got a set of ae82 twin cam discs for the rear coming soon and ill get them in as soon as i can
is there any real benefit in gettin steel braided lines or is that just for hardcore racing?
I've looked at upgrading the brakes at the front but ive only got 14"s. Plus if i was going to upgrade
to something like the ae92 levin gtz stuff i'd have to get ae92 struts and then theres more cash and effort.
Although i dont know how much work is involved in swapping over a brake booster, is it a lot?g
cheers guys
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Location:
Brisbane
Registered:
May 2002
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Re: AE82 more brake boost?
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Tue, 20 July 2004 06:45
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If your brake pedal is excessively hard, there is something wrong with your brakes; the pedal in an AE82 should be quite compliant. Upgrading to a bigger booster is not the answer here.
The first thing I'd check is the hose connecting the booster to the plenum; if this is leaking or disconnected entirely the booster won't work properly. The booster itself could also be a problem, eg punctured diaphragm, so that's another thing to check. Failing that it's something more serious amiss, such as a seized caliper.
If you don't feel confident messing around with your brakes I'd recommend taking the car to a reputable mechanic (if such a thing exists).
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Location:
Adelaide
Registered:
July 2002
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Re: AE82 more brake boost?
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Tue, 20 July 2004 10:07
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ok sorry its not excessively hard for driving around town, but once you start driving hard it gets really bad and noticeable and it also starts to vibrate kinda feels like the discs need to be machined but once it cools off its ok again...wierd. the discs were machined about 10,000-15,000 ago so they should be ok
im using ferodo zero disc pads
will i get any difference in feel when i swap the drums on the rear for discs?
thanks
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Location:
Brisbane
Registered:
August 2003
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Re: AE82 more brake boost?
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Tue, 20 July 2004 13:07
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Have you checked the condition of the pads and rotors, or the brake fluid?
Also ae92 gtz front brakes will bolt straight on, you'll just need to bend back the existing dust cover.
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Location:
Brisbane
Registered:
May 2002
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Re: AE82 more brake boost?
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Tue, 20 July 2004 23:10
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It sounds like the discs are worn and thus warping when they get hot. Check the thickness of the discs and compare to the minimum thickness specs of your discs (you can look it up on DBA's web site if you're not sure).
As above check the condition of your brake pads, and even if they're in good condition throw them out and get some decent pads!
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Location:
Adelaide
Registered:
July 2002
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Re: AE82 more brake boost?
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Tue, 20 July 2004 23:26
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the discs are on the minimum thickness, the guy who machined them said that this will be their last run and wont take another machining. Maybe time to invest in some new rotors? The pads seem to be ok bout 40% left. I've found the ferodo pads to be much better than standard pads, what do you guys recommend??
Levin brakes?? so the caliper will bolt on? i thought the holes for caliper had to be drilled out on the steering knuckle because they were to small, how big is the rotor? i only have 14"s  will it fit?
Guess its just a matter of finding them then, what else would be a good upgrade if i cant get hold of levin brakes? would the standard master cylinder be enuff to drive upgraded fronts and ae82 t/c rear disks? i've heard there is a valve or something that controls the bias for the rear in the single cam master cylinder and that this needs to be removed when putting in rear discs to stop them locking up before the fronts, anyone konw where the valve is exactly?? how much would an adjustable valve cost so that i could set the bias myself? I thought i read somewhere that the old hq style holdens have one stock? can this be made to work with my set up? i dont need and incar one just one in the engine bay would be fine
Thanks
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Location:
Brisbane
Registered:
August 2003
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Re: AE82 more brake boost?
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Wed, 21 July 2004 02:58
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According to this page, they'll bolt straight in.
http://www.twincam.org/forums/index.php?showtopic= 1063
The ae92 gtz brakes are the same as the series 2 sx/gti brakes. You can pick them up for $150-200 with pads and in good condition. You might want to look at that before spending the money on new rotors.
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Location:
Newcastle NSW
Registered:
June 2002
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Re: AE82 more brake boost?
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Thu, 22 July 2004 09:01
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there is a difference in master cylenders betwen the disk and drum setup. the drum master has a resrictor for the rear to keep pressure there so the drums dont suck in air. this also makes a disk rear constantly drag the pads and wear them out faster.
the proportioning is carried out internally by the master cylender and can only be changed profesionally (big $$$) or by some major reworking of the brake setup.(not recomended)
i have a stock AE82 twinky setup in my rolla with new custom grooved rotors, ebc greenstuff front pads and bendix metal rears.
these brakes stop VERY well with great feel 160-0 with no fade at all. dont know how long they can be pushed for tho.
the shudder you are experiencing may also be a hairline crack caused by heat and the rotors being too thin. these only show themselves when the rotor gets hot and expands
solution- overhaul and upgrade and youll have a safer car
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Location:
Melbourne
Registered:
May 2002
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Re: AE82 more brake boost?
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Fri, 23 July 2004 09:45
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Look there could be a number of things causing this problem. Having your discs on minium thickness aint a good start or good idea. They heat up faster and fade quicker. If you brake pedel is excessivly hard this means your booster is cactus, from what you describe it doesnt sound like this is the case. Secondly what brake pads may you be running? The quality of pads could have a great effect on your cars braking ablility. Check your booster vacc hose and make sure it is actually proper booster vacc hose, becuase this will make a big difference. Also check your one way valve on your vac hose make sure that is not deffective. Your brakes may need bleeding, your seals in your master cyl might be shot or bore scored. Finally check that your handbrake cable is tensioned properly cause this can cause the brakes not to work properly.
Good luck with the search.
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Location:
Adelaide
Registered:
July 2002
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