luke
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| posted on 7/5/09 at 10:26 PM |
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rear drums or discs
hey all,
ive been indecisive about this for the last few weeks wether to leave the back as drums or convert it to discs.
im only currently running a 1300 but the plan is to put larger engines after IVA.
so what do people think? in my mind as im now welding brackets onto the axle now would be time to convert it over.
luke
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Steve Hignett
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| posted on 7/5/09 at 10:30 PM |
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Stick with Drums!
they are more than up to the job on car's this light and they often weigh less than the Disc setups anyway!
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omega0684
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| posted on 7/5/09 at 10:32 PM |
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personal preference i think, drums are more than up for the job, unless you are going to big power 200+bhp then i would convert.
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snapper
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| posted on 7/5/09 at 10:34 PM |
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If you do fit discs you will need some form of presure relieveing valve to prevent the rears locking up
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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britishtrident
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| posted on 7/5/09 at 10:37 PM |
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Drums are well up to the job but discs give a better more predictable feel for serious use --- reason being drums and shoes tend to flex when
subject to high forces from the wheel cylinder.
With disc brakes mechanical flexing only becomes significant with 4 or 6 pot alloy calipers.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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luke
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| posted on 7/5/09 at 10:46 PM |
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ok cool!
other question, would you go bias bar set up?
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ReMan
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| posted on 7/5/09 at 11:07 PM |
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No not essential, neither is a balance valve
SVA with it fully open and I've still not touched it 3 years on
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A1
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| posted on 7/5/09 at 11:46 PM |
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id go discs, but watch the wilwood rears, apparently the handbrakes not too good. im using sierras on the rear, and she stops pretty sharpish. but
they are quite heavy, not sure when compared to drums though.
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asl
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| posted on 8/5/09 at 06:36 AM |
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I have an MK IndyBlade and currently have drums. I wanted to upgrade to discs as I thought it would be better. Bearing in mind I have driven the car
for a year including some track days and already the braking was sufficient. When I took the rear off to change the diff I discovered that both my
rear brake cylinders had been seized off for some time!! Just goes to show that such a light car the front alone was sufficient!! I have decided to
stick with drums based on that (haqving replaced the cylinders of course) will be interesting to see if I notice a difference.
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goaty
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| posted on 8/5/09 at 06:48 AM |
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there are bolt on brackets avliable so you can leave it till a later date and its still easy enough to convert.
What axle are you running?
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iank
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| posted on 8/5/09 at 07:06 AM |
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Minor advantage of drums is a better handbrake.
Minor advantage of disks easier to check wear (not that rear disks or drums should ever wear out on normal 7 milages).
Drums are often lighter and more than up to the job of stopping the car.
Drums win by a short head if you already have them - it's certainly not worth spending money replacing them. If you think they'll improve
the braking you'll be disappointed.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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britishtrident
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| posted on 8/5/09 at 07:32 AM |
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If you want good brakes he secret is choosing the right mastercylinder ie one with a smaller bore than the the Sierra or other cars with a servo.
Also make sure your mastercylinder and pedal box are as solidly mounted and as stiff as possible.
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britishtrident
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| posted on 8/5/09 at 07:36 AM |
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quote:
Originally posted by iank
Minor advantage of drums is a better handbrake.
Minor advantage of disks easier to check wear (not that rear disks or drums should ever wear out on normal 7 milages).
Drums are often lighter and more than up to the job of stopping the car.
Drums win by a short head if you already have them - it's certainly not worth spending money replacing them. If you think they'll improve
the braking you'll be disappointed.
Yep as general rule brakes shoes will last at least twice as long as pads, they also have the advantage of self servoing to a degree at light pedal
presures which gives good brake balance on variable road surfaces and conditions --- a bit like a self adjusting brake bias.
For road use drums are a good choice but for track use always choose discs.
[Edited on 8/5/09 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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coozer
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| posted on 8/5/09 at 08:28 AM |
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Nice interesting discussion, I am currently upgrading my 8" drums for some wopping 10" jobbies.
The wheel cylinders are going to be bigger, by about 2mm I think. If I stay with the current size master cyclinder will I have an improved system?
Steve
1972 V8 Jago
1980 Z750
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lotusmadandy
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| posted on 8/5/09 at 08:29 AM |
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Hi luke,
the general view on here seems to
be to stick with the drums.
I built my mk with drums but then changed
to a sierra disk set up after the sva,i
personaly think the padal has more feel after using the drums and the car brakes
flatter than before.The handbrake is excellent too and i havent noticed any significant
pad wear.Also the disks look better than the drums through the wheels.
Andy
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stevegough
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| posted on 8/5/09 at 08:42 AM |
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quote:
Originally posted by luke
ok cool!
other question, would you go bias bar set up?
I'm glad you have started this discussion - I am at the same crossroads myself and, after having read the replies, I am going to stick with
drums.
As far as the Bias bar goes, I have already fitted mine and, after reading the info posted in other areas of this forum regarding the new IVA rules -
I wish I'd not bothered.
In case you aren't aware, you set your bias bar up, then permanently fix it so it can't be moved again - with SVA drilling and pinning
locknuts was sufficient - with IVA you have to weld the locknut and also along the rest of the thread.
I have to ask - what if you've set it up wrong? .jpg)
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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bob
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| posted on 8/5/09 at 02:06 PM |
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I was using a fiat uno valve for bias but after 5 years i have binned it, it was always fully open even for SVA and still restricted the rear calipers
too much.
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