Go Back   Team-BHP > Under the Hood > Modifications & Accessories


Reply
 
Thread Tools Search this Thread
Old 20th June 2006, 17:24   #31
BHPian
 
Join Date: Aug 2005
Location: Bangalore
Posts: 978
Thanked: 5 Times
Default

What I meant was that rear drums could be "adequate" (not necessrily better)... "excessive" braking at rear wheels is undesirable (be it drums or disks), front wheels need to be improved instead. We don't need disks at rear as badly as front wheels. I have given valid reasons why I think so for non- ABS/EBD cars. Why other higher end models prefer disks even at rear is something that I am trying to find out! May be the answer lies in having ABS/EBD, or may be something else. If you know it then please share...

One thing I know is that fishtailing is used to their advantage by skilled racer guys to take real quick turns at high speeds, but that shouldn't be applicable to normal drivers, I suppose! Those people need disks all over.
santosh.s is offline   Reply With Quote
Old 20th June 2006, 18:29   #32
BHPian
 
Join Date: Aug 2005
Location: Bangalore
Posts: 978
Thanked: 5 Times
Default

@honda, if you don't believe me then here are a couple of links from the same site as mentioned by viper (it happens to be a company selling brake upgrades!). They have not specifically talked about drum versus disks, but the importance of front and rear brake balance is explained in great detail, they have also expained why it is not all that necessary to upgrade rear brakes.

http://www.stoptech.com/tech_info/wp...formance.shtml
http://www.stoptech.com/tech_info/wp...upgrades.shtml
santosh.s is offline   Reply With Quote
Old 21st June 2006, 18:45   #33
BHPian
 
Join Date: May 2005
Location: Madras
Posts: 379
Thanked: 3 Times
Default

Quote:
If you think Rear Drums are better than Disc then please explain why do cars like Skoda, Accord and other cars in their segment have rear Disc....
A small correction, The Octavia does not have rear disc brakes but drums. The Corolla, Elantra have disc brakes.

Santosh.S disc brakes are the standard on most cars abroad and they are definitely better than drum brakes in the rear.
5u3zEr0 is offline   Reply With Quote
Old 21st June 2006, 20:36   #34
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,381
Thanked: 22,601 Times
Default

Quote:
Originally Posted by 5u3zEr0
A small correction, The Octavia does not have rear disc brakes but drums. The Corolla, Elantra have disc brakes.

Santosh.S disc brakes are the standard on most cars abroad and they are definitely better than drum brakes in the rear.
Correction to your correction -

The petrol octavias have rear discs.

cya
R
Rehaan is offline   Reply With Quote
Old 21st June 2006, 20:47   #35
BHPian
 
Join Date: Aug 2005
Location: Bangalore
Posts: 978
Thanked: 5 Times
Default

Quote:
Originally Posted by 5u3zEr0
Santosh.S disc brakes are the standard on most cars abroad and they are definitely better than drum brakes in the rear.
That is a known fact, but that is not enough to say that all disks will always be better. If you think of single brake alone, disk may have more advantages over drums than disadvantages. But for a whole system of 4 wheels, it is most important to have right front to rear bias. When manufacturers put disks on all wheels, they must be doing all the analysis required and come up with optimum bias. But when you are replacing stock drums by disks, you can not blindly say that its going to be better. See the first link in my previous post, the last figure (figure 7) explains how braking distance can be increased due to too much of bias either towards front or rear. How do you make sure that you are not spoiling your braking distance, though you are sure that you are going for "better" brakes? There is a good chance that after mods, the braking distance becomes more than what it was with inferior stock drums.
santosh.s is offline   Reply With Quote
Old 22nd June 2006, 13:04   #36
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,381
Thanked: 22,601 Times
Default

Very well said Santosh.s,

What seems better in theory might not always work out better in reality.

Thats why i asked Turboindia this. (still waiting for a reply btw...)

cya
R
Rehaan is offline   Reply With Quote
Old 22nd June 2006, 13:16   #37
BHPian
 
Ford Rocam's Avatar
 
Join Date: Feb 2005
Location: Mumbai-India
Posts: 880
Thanked: 16 Times
Default

Ya it has to be effective or else no point lets wait for turbo india's reply infact it should be tested with gtech pro if possible.
Ford Rocam is offline   Reply With Quote
Old 22nd June 2006, 14:04   #38
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,381
Thanked: 22,601 Times
Default

No doubt that when set up correctly it will be more effective that drums at the rear, but its not just as simple as throwing them on and then seeing a greatly improved braking performance.

Hopefully turboindia can share if he had any teething problems while getting them set up right, and also whether they made a 5% difference or a 50% difference.

I guess a simple way to get it right would be to have a simple bias valve (basically a tap on the line to the rear brakes) and tweak it whilst testing.

cya
R
Rehaan is offline   Reply With Quote
Old 23rd June 2006, 18:36   #39
BHPian
 
Join Date: May 2005
Location: Madras
Posts: 379
Thanked: 3 Times
Default

Quote:
Correction to your correction -

The petrol octavias have rear discs.
Thanks for correcting me, Rehaan and this is surprising. Why the hell does Skoda short change the Diesel, then??

@ Santosh.s : You have a good point there. Did not think of it with respect to aftermarket upgrade to rear discs.
5u3zEr0 is offline   Reply With Quote
Old 24th June 2006, 09:50   #40
BHPian
 
turboindia's Avatar
 
Join Date: Nov 2004
Location: Cochin
Posts: 253
Thanked: 2 Times
Default

Quote:
Originally Posted by Rehaan
Very well said Santosh.s,

What seems better in theory might not always work out better in reality.

Thats why i asked Turboindia this. (still waiting for a reply btw...)

cya
R
Hey sorry guys. Was a bit tied up.

OK so on my Honda city the rear disks made atleast a 15% difference. OK and the difference was the most in high speed braking. I had got the whole kit that comes on the City TYPE II in Thailand and that included the bias valve. I remember them telling that the percentage of pressure send to the front and the rear for a car with the drums and one with the disks were different and hence the valve had to be changed. This was not an adjustabe one so we did not get to tweak it.
Overall the car just did brake much better especially when we were pushing it hard.

Unfortunately I dont have any images of the install,

Hope this helps
turboindia is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulsar 200NS - Rear wheel stuck - Disc Brake samigo Motorbikes 21 10th September 2014 23:53
Dummy (cosmetic) rear disc brakes itwasntme Modifications & Accessories 1 18th May 2009 15:04
Disc Brakes for Swift Back wheel pshyamsundar Modifications & Accessories 39 3rd February 2009 13:32
Disc Brakes - can someone xplain them to me? Shan2nu Technical Stuff 17 9th March 2006 00:08


All times are GMT +5.5. The time now is 22:14.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks