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


Reply
 
Thread Tools Search this Thread
Old 10th March 2009, 22:57   #16
BHPian
 
equinox22's Avatar
 
Join Date: Mar 2009
Location: Chicago/Pune
Posts: 163
Thanked: 3 Times
Default

Quote:
Originally Posted by amohit View Post
question: When we press the foot brake peddle, which brakes are applied front/rear/or both.
and when we engage the parking brakes?

Regards,
On pressing the brake pedal, usually both front and rear brakes are applied. The degree of application varies if you have EBD/ABS based on the road conditions and traction for each wheel.
The parking brake is usually mechanical and applies to the rear wheels only.
equinox22 is offline   Reply With Quote
Old 10th March 2009, 23:14   #17
Senior - BHPian
 
rider60's Avatar
 
Join Date: Mar 2007
Location: Bhagyanagaram. (A.K.A. Hyderabad)
Posts: 1,619
Thanked: 47 Times
Default

Quote:
Originally Posted by VMG View Post

FYI, verna has only front disc barkes in all versions.

the new vernas do sport rear discs on their ABS models alone, the verna crdi SX has rear disc brakes.

the ones before that dint have rear disc brakes.
rider60 is offline   Reply With Quote
Old 11th March 2009, 11:35   #18
Distinguished - BHPian
 
supremeBaleno's Avatar
 
Join Date: Dec 2005
Location: Weekdays@Chennai, Weekends@Kerala
Posts: 5,164
Thanked: 1,635 Times
Default

Quote:
Originally Posted by equinox22
The parking brake is usually mechanical and applies to the rear wheels only.
This is my understanding too.

But yesterday a colleague had a different take on this. He said parking brake applies to the front wheels. Reasoning being that when illegally parked vehicles are towed away, almost always it is the front which is lifted with only rear wheels making contact with the ground. If parking brake applied to rear wheels, they won't rotate and tyres would end up getting damaged due to car being dragged along.

While it does sound logical, I still think hand-brake applies to rear wheels and that while towing, the cops disengage the hand-brake somehow.
supremeBaleno is offline   Reply With Quote
Old 11th March 2009, 11:58   #19
Senior - BHPian
 
Surprise's Avatar
 
Join Date: Feb 2005
Location: Chennai
Posts: 2,299
Thanked: 129 Times
Default

So can cars be towed with handbrake on? - Yahoo! Answers

SB, here is the answer on how to tow the car even if its on hand brake
Surprise is offline   Reply With Quote
Old 11th March 2009, 12:02   #20
BHPian
 
Strangerintown's Avatar
 
Join Date: May 2006
Location: Mumbai
Posts: 184
Thanked: 48 Times
Default

Quote:
Originally Posted by supremeBaleno View Post
This is my understanding too.

But yesterday a colleague had a different take on this. He said parking brake applies to the front wheels. Reasoning being that when illegally parked vehicles are towed away, almost always it is the front which is lifted with only rear wheels making contact with the ground. If parking brake applied to rear wheels, they won't rotate and tyres would end up getting damaged due to car being dragged along.

While it does sound logical, I still think hand-brake applies to rear wheels and that while towing, the cops disengage the hand-brake somehow.
I have seen the cops opening the car door to disengage the hand brakes before towing. They probably use the same technique to open the door that a car thief would. Not sure how legal this is though.
Strangerintown is online now   Reply With Quote
Old 11th March 2009, 12:33   #21
Senior - BHPian
 
goandude's Avatar
 
Join Date: Jul 2007
Location: Bengaluru
Posts: 1,336
Thanked: 437 Times
Default

For the thread starter, Yes Disc brakes are more expensive than drums, and more evvective too. They do not fade as fast as drums, mainly as they cool faster (ventilated discs cool even faster) Now the question that begs an answer is how much more expensive are they over drums? Apparently - a LOT.
This is because only higher end cars have these on the rear. (IMO this is one of the most visible diffreciaters of D segment salons).
PS- dont want to rake up the segmentisation of salons which covers many pages on linea discussion. BUt this is only my opinion,
goandude is offline   Reply With Quote
Old 11th March 2009, 13:20   #22
Senior - BHPian
 
hellstar's Avatar
 
Join Date: Dec 2006
Location: Bangalore
Posts: 1,071
Thanked: 17 Times
Default

Quote:
Originally Posted by rider60 View Post
the new vernas do sport rear discs on their ABS models alone, the verna crdi SX has rear disc brakes.

the ones before that dint have rear disc brakes.

yep all vernas with ABS have all round disc brakes
hellstar is offline   Reply With Quote
Old 11th March 2009, 17:59   #23
BHPian
 
Join Date: Jul 2007
Location: Bangalore
Posts: 448
Thanked: 33 Times
Default

Quote:
This is because only higher end cars have these on the rear. (IMO this is one of the most visible diffreciaters of D segment salons).
Or is it that disc brakes are much more effective than drums and its not very safe to put them on cars without ABS?
amohit is offline   Reply With Quote
Old 11th March 2009, 19:15   #24
BHPian
 
equinox22's Avatar
 
Join Date: Mar 2009
Location: Chicago/Pune
Posts: 163
Thanked: 3 Times
Default

About the issue regarding the parking brake, can anyone confirm if there are cars which apply the parking brake to the front wheels? I verified on mine and its rear for sure. I think it is on the rear in most cases. Thats how people drift using the E-brake!
equinox22 is offline   Reply With Quote
Old 11th March 2009, 21:41   #25
BHPian
 
equinox22's Avatar
 
Join Date: Mar 2009
Location: Chicago/Pune
Posts: 163
Thanked: 3 Times
Default

Getting back to the topic of rear disk brakes. The main reason for not doing it is cost. There are 2 reasons for the higher cost.
1. Disk brake systems by themselves cost more.
2. The parking brake system is more complicated and hence more expensive if the rear brakes are disks as compared to drums.
equinox22 is offline   Reply With Quote
Old 12th March 2009, 03:54   #26
BHPian
 
Ali G's Avatar
 
Join Date: Aug 2007
Location: Bombay
Posts: 101
Thanked: Once
Default

besides cost being a factor, I personally think that since most sedans in India are FWD in which braking has a weight bias to the front, hence the discs are ideally located there. Leaving approx 40% of the braking to the rear, manufacturers believe drums would do the job. Could this also be a reason why we are deprived of the rear wheel drive culture in india?
Ali G is offline   Reply With Quote
Old 12th March 2009, 14:16   #27
BHPian
 
d_himan's Avatar
 
Join Date: Nov 2006
Location: Bombay
Posts: 728
Thanked: 589 Times
Default

Are they really so expensive? From a A.S.S perspective, the Discs themselves are really cheap (~280 bucks for Swift)....
d_himan is online now   Reply With Quote
Old 12th March 2009, 14:20   #28
Team-BHP Support
 
bblost's Avatar
 
Join Date: Jul 2007
Location: Hyderabad
Posts: 9,650
Thanked: 6,661 Times
Default

Quote:
Originally Posted by d_himan View Post
Are they really so expensive? From a A.S.S perspective, the Discs themselves are really cheap (~280 bucks for Swift)....
That's it. Wow, I was thinking them to be much more expensive that 280.

The bullet disc brake setup costs about 7k.
It includes the
disc,
calipers,
cable,
lever,
spokes
and hub.

So was thinking that the largest and heaviest component would be the most expensive as well.
bblost is offline   Reply With Quote
Old 12th March 2009, 14:44   #29
Senior - BHPian
 
goandude's Avatar
 
Join Date: Jul 2007
Location: Bengaluru
Posts: 1,336
Thanked: 437 Times
Default

Quote:
Originally Posted by equinox22 View Post
2. The parking brake system is more complicated and hence more expensive if the rear brakes are disks as compared to drums.
Very valid point there. BTW how does a parking break work with rear discs.
goandude is offline   Reply With Quote
Old 12th March 2009, 14:52   #30
Distinguished - BHPian
 
sgiitk's Avatar
 
Join Date: Dec 2007
Location: Kanpur
Posts: 7,160
Thanked: 3,754 Times
Default

Discs in the rear have everything going for them but for the following:

1. With weight transfer on braking you do not need that much rear braking, so drums may suffice.

2. The main problem is that while Drums are self actuating (the shoe is levered into the drum once even a light contact is applied) the same is not true for the disc. The result is that you may have to add some gimmicks for the hand brake. In the 70's the hand brakes of even cars like Porsches were a joke. Many cars came with small inboard drums just for the hand brake function.
sgiitk 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 17:59.

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