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#1
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Rear disc brake swap
Does anybody have any information on how to swap rear drum brakes with disc
brakes for 91 civic hb? Cons/pros? |
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#2
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On 28 Jan 2005 19:10:08 GMT, "TeGGer®" > wrote:
>> Does anybody have any information on how to swap rear drum brakes with >> disc brakes for 91 civic hb? >> Cons/pros? >Some Civics came with rear discs (EX?) > >You'd need the parking brake cables, proportioning valve, discs, backing >plates, mount brackets, calipers, new flex lines, etc., and maybe even the >trailing arms and wheel bearings > >I would not advise the swap. Neither would I. That proportioning valve in itself is a tricky business. You can't just casually fit bigger, meaner brakes into the back of a vehicle. If you do the rear wheels may lock right up while the fronts are still only braking slightly. This can result in the car swapping ends unexpectedly. Even with a proportioning valve installed to prevent this, it might not be set right for a vehicle it wasn't designed for. |
#3
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You won't see any better braking, only a "bling bling" factor.
You'll need master cylinder, prop. valve, ebrake cables, trailing arms complete to hub assembly, and different brake lines. Also figure on cutting out EACH bolt on the back. In short, not worth the effort. "Sean" > wrote in message ... > Does anybody have any information on how to swap rear drum brakes with disc > brakes for 91 civic hb? > Cons/pros? > > > |
#4
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Sean wrote:
> Does anybody have any information on how to swap rear drum brakes with disc > brakes for 91 civic hb? > Cons/pros? you need the right proportioning valve, hoses, backing plates/hub assemblies, hand brake cables and of course, disks & calipers. you also need a t50 torx driver. use a good quality one - NOT lisle. lisle make good tools for many applications, but their torx drivers are grossly inferior. i rounded off two before i finally figured out that it was the tool, not the backing plate bolt. a lot of people change out the whole trailing arm assemblies, but that's not essential, particularly if your trailing arm bushes are in good condition & the donor vehicle's aren't. leaving your old trailing arms in place also means you don't have to do a new rear end alignment. if you're going to do this, you may as well go for the big disks on the front as well, 10.25" vs 9.5" standard, and if you do that, you'll need bigger calipers, the bigger diameter master cylinder & the bigger vacuum booster. the steering knuckles are not necessary unless you're worried about the splash plate being slightly too small. unless your climate is absolutely abysmal, i really can't see it making any more difference than having spoked alloy wheels vs steelies. here's what i've worked out on proportioning valves. if anyone else knows different, please post. there's a number stamped into the one of the two main halves near where they're joined. if your original proportioning valve reads something like "3025" and you get rear disks from a vehicle reading "4040" [like an integra] and you /don't/ change the front disks, you need a "3040" proportioning valve [from an 88 accord ex/s]. if you do use the bigger front disks, you need the 4040. master cylinders are best changed complete with the vacuum booster as the bolt-on patterns are different depending on model/year. just so long as the brake lines align. the closest fit for my 89 civic, without doing any re-plumbing, is the 88 accord again. it has a 15/16" piston diameter. i'd prefer a 1" cylinder from a del sol or an integra, but that requires a different brake line fitting. not impossible, but it's not as close to being direct bolt-on as the rest of the conversion. some day, i'll get around to sending "how-to" pics to tegger for hosting. |
#5
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John Ings wrote:
> On 28 Jan 2005 19:10:08 GMT, "TeGGer®" > wrote: > > >>>Does anybody have any information on how to swap rear drum brakes with >>>disc brakes for 91 civic hb? >>>Cons/pros? > > >>Some Civics came with rear discs (EX?) >> >>You'd need the parking brake cables, proportioning valve, discs, backing >>plates, mount brackets, calipers, new flex lines, etc., and maybe even the >>trailing arms and wheel bearings >> >>I would not advise the swap. > > > Neither would I. That proportioning valve in itself is a tricky > business. You can't just casually fit bigger, meaner brakes into the > back of a vehicle. If you do the rear wheels may lock right up while > the fronts are still only braking slightly. This can result in the car > swapping ends unexpectedly. Even with a proportioning valve installed > to prevent this, it might not be set right for a vehicle it wasn't > designed for. > hondas already have proportioning valves, and they're not very tricky - you just need to pick the right one. they're a direct bolt-on swap. |
#6
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On Fri, 28 Jan 2005 20:54:28 -0800, jim beam >
wrote: >hondas already have proportioning valves, and they're not very tricky - >you just need to pick the right one. they're a direct bolt-on swap. And how do you pick the right one for a vehicle that had different rear brakes originally? |
#7
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Well, if it were a 91 CRX or an 89 accord it would be easy to pick the right
parts. Those cars both had a model with rear disc. "John Ings" > wrote in message ... > On Fri, 28 Jan 2005 20:54:28 -0800, jim beam > > wrote: > >>hondas already have proportioning valves, and they're not very tricky - >>you just need to pick the right one. they're a direct bolt-on swap. > > And how do you pick the right one for a vehicle that had different > rear brakes originally? > > |
#8
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But the 1991 EX civic had drums in the back.
> > One off an EX would work. > |
#9
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No, that's the problem, I think as far as civic like vehicles from that
generation, only the CRX Si had disc. I don't know how easy it would be to swap over to a civic. "TeGGer®" > wrote in message .. . > "Jafir Elkurd" > wrote in > : > >> >>> >>> One off an EX would work. >>> >> >> >> >> But the 1991 EX civic had drums in the back. >> > > > > An Si then? Poor memory happening here... > > -- > TeGGeR® > > The Unofficial Honda/Acura FAQ > www.tegger.com/hondafaq/ |
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