Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 20th May 2009, 12:12   #61
Senior - BHPian
 
nitrous's Avatar
 
Join Date: May 2004
Location: UAE/Lon/Madras
Posts: 6,966
Thanked: 282 Times
Default

MGP Ventilated rotors for my Esteem cost me 625 bucks.
nitrous is offline   Reply With Quote
Old 20th May 2009, 12:47   #62
BHPian
 
im_srini's Avatar
 
Join Date: Sep 2006
Location: Portland
Posts: 956
Thanked: 368 Times
Infractions: 0/1 (5)
Exclamation Eating crow !

Quote:
Originally Posted by im_srini View Post
Hi Himan, Maruti spares are cheap, but not that cheap If I remember correct, the Alto's front disks themselves cost around Rs.600 each. The Swift's front disks, which are ~2" wider (diameter), & are also vented, cost around Rs.1,600 each.
P.S. - All prices are 2008 April prices
Quote:
Originally Posted by nitrous View Post
MGP Ventilated rotors for my Esteem cost me 625 bucks.
Hi Nitrous, thanks, I guess its time to eat humble pie

The latest prices for the Swift's front disks - non-ABS rotors cost Rs.862 each & ABS rotors cost Rs.994 each.
im_srini is offline   Reply With Quote
Old 20th May 2009, 13:21   #63
Senior - BHPian
 
nitrous's Avatar
 
Join Date: May 2004
Location: UAE/Lon/Madras
Posts: 6,966
Thanked: 282 Times
Default

Srinivasan, Whats the difference between abs and non-abs rotors for the swift?
nitrous is offline   Reply With Quote
Old 20th May 2009, 13:49   #64
BHPian
 
im_srini's Avatar
 
Join Date: Sep 2006
Location: Portland
Posts: 956
Thanked: 368 Times
Infractions: 0/1 (5)
Question

Quote:
Originally Posted by nitrous View Post
Srinivasan, Whats the difference between abs and non-abs rotors for the swift?
Hi Nitrous, I'm not sure myself, at first I thought it was due to the toothed ABS sensor ring, but the ring is actually on the driveshaft & not the disk itself.

Perhaps vikram_d or ram_hyundai could help out here...
im_srini is offline   Reply With Quote
Old 1st January 2010, 14:30   #65
BHPian
 
d_himan's Avatar
 
Join Date: Nov 2006
Location: Bombay
Posts: 728
Thanked: 589 Times
Default

Quote:
Originally Posted by im_srini View Post
Hi Nitrous, thanks, I guess its time to eat humble pie

The latest prices for the Swift's front disks - non-ABS rotors cost Rs.862 each & ABS rotors cost Rs.994 each.
sorry guys, wasn't tracking this thread...

im_srini: it reads 289/- in MASS's bill (Sai Service - Andheri). I got the disc+pad job+a host of jobs done - so perhaps the item-wise split may have been faulty.
d_himan is online now   Reply With Quote
Old 1st January 2010, 22:26   #66
BANNED
 
Join Date: Apr 2006
Location: chennai
Posts: 703
Thanked: 54 Times
Default

Cost of adding discs over drums is just a marginal increase for the manufacturers .
Braking force is directly proportional to the surface area of the braking material and the force applied for braking . A drum brake has more braking surface area than a disc brake . A disc brake has much better clamping power and that is the reason for using it in the front wheels .

The reason why ABS is better on a 4 disc setup is because discs tend to lock up with excessive force and ABS is good and works well ,but drums seldom lock up ( if designed properly) so without ABS I would prefer a disc and drum setup only .



A good set of brakes should be able to effectively retard the vehicle and not lock up the wheels . Drum brakes are much better in this application as they use lesser pressure but more surface area which results in a better braking compared to a disc brake .

On alot of forums I have come across posts which say that discs cool faster , but discs also heat up much more due to smaller surface area and higher clamping force . Drums dont heat up that much compared to discs , and since drums dont cool off faster , the braking is more better .

The above observations are by me and not technical .
greatmana2000 is offline   Reply With Quote
Old 14th January 2011, 00:40   #67
BHPian
 
AvinashKeezh's Avatar
 
Join Date: Aug 2005
Location: Bangalore
Posts: 232
Thanked: 10 Times
Default Re: Disc Brakes - Are they very expensive

how feasible is it to change the rear drum setup to rear disc, as an aftermarket fitment?
assuming the car already has ABS & EBD
AvinashKeezh is offline   Reply With Quote
Old 14th January 2011, 02:01   #68
Senior - BHPian
 
vivekiny2k's Avatar
 
Join Date: Feb 2005
Location: cincinnati, jabalpur,chennai
Posts: 1,241
Thanked: 163 Times
Default Re: Disc Brakes - Are they very expensive

Quote:
Originally Posted by greatmana2000 View Post

The reason why ABS is better on a 4 disc setup is because discs tend to lock up with excessive force and ABS is good and works well ,but drums seldom lock up ( if designed properly) so without ABS I would prefer a disc and drum setup only .


The above observations are by me and not technical .
to get a little technical, on exactly the same surface, if disc is locking up and drum is not, then drum is not supplying enough braking power.
vivekiny2k is offline   Reply With Quote
Old 14th January 2011, 17:20   #69
CPH
BHPian
 
Join Date: Jan 2010
Location: London
Posts: 577
Thanked: 33 Times
Default Re: Disc Brakes - Are they very expensive

Quote:
Originally Posted by greatmana2000 View Post
Cost of adding discs over drums is just a marginal increase for the manufacturers .
Braking force is directly proportional to the surface area of the braking material and the force applied for braking . A drum brake has more braking surface area than a disc brake . A disc brake has much better clamping power and that is the reason for using it in the front wheels .

The reason why ABS is better on a 4 disc setup is because discs tend to lock up with excessive force and ABS is good and works well ,but drums seldom lock up ( if designed properly) so without ABS I would prefer a disc and drum setup only .



A good set of brakes should be able to effectively retard the vehicle and not lock up the wheels . Drum brakes are much better in this application as they use lesser pressure but more surface area which results in a better braking compared to a disc brake .

On alot of forums I have come across posts which say that discs cool faster , but discs also heat up much more due to smaller surface area and higher clamping force . Drums dont heat up that much compared to discs , and since drums dont cool off faster , the braking is more better .

The above observations are by me and not technical .
In Europe ABS on trucks was legally enforced a long time ago. This was quite a few years before disc brakes found their way into anything above 7.5 tons. ABS control can be done on either very effectively.

Either brakes have their advantages and disadvantages. Disc brakes are easier to cool down and clean themselves easier than drum brakes.

When drum brakes are too small, surface material tends to glaze faster and makes them inefficient. Measures for de-glazing are much more expensive on drum brakes.

Many manufacturers still use drums at the rear as they are cheaper to produce and the brake force is so little (only about 15-20% of the total break force) that heat is no problem.

On small cars drum brakes are the better solution at the rear as they are usually lighter than equivalent disc brakes, reducing unsprung wieght unless carbon brakes are applied.
CPH 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
Bikes - Anti Lock Braking system on Disc Brakes mail4ajo Motorbikes 10 2nd March 2015 11:40
Disc Brakes for Rear Wheel ~ H O N D A ~ Modifications & Accessories 39 24th June 2006 09:50
Disc Brakes - can someone xplain them to me? Shan2nu Technical Stuff 17 9th March 2006 00:08
A very very very hot Murcielago. v12 The International Automotive Scene 18 14th July 2004 22:04


All times are GMT +5.5. The time now is 14:09.

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