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


Reply
 
Thread Tools Search this Thread
Old 20th January 2010, 17:13   #1
Newbie
 
Join Date: Aug 2009
Location: Bangalore
Posts: 8
Thanked: 0 Times
Default i20 brakes - problem when ignition is off

Hello,

I own an i20 1.2 Asta. I am facing a peculiar problem with brake. Once I switch off ignition, I feel brake is not working! After switching off ignition, if I press and release brake pedal around 3 times, it gets tightened. When I tried to apply a lot of force, brake pedal didn't move. And then I loose braking!! I rechecked this by keeping my car on a slightly inclined surface. Did any of the i20 owners face this problem?

Ravi
aristocratic50 is offline   Reply With Quote
Old 20th January 2010, 17:50   #2
jav
BHPian
 
Join Date: Apr 2007
Location: Bangalore
Posts: 194
Thanked: 6 Times
Default

When the engine is running the brake booster is powered by vacuum which reduces braking effort, when engine is off there is no more vacuum to power the booster which makes the pedal very hard to press. If the pedal gets hard during engine running then there is problem with the brakes.
jav is offline   Reply With Quote
Old 20th January 2010, 18:02   #3
BHPian
 
Maverick1977's Avatar
 
Join Date: Aug 2007
Location: Mumbai
Posts: 832
Thanked: 249 Times
Default

There is absolutely no problem with your brakes. Every car fitted with vaccum assisted braking will work in the same manner. Happens in my Vista also.
Maverick1977 is offline   Reply With Quote
Old 20th January 2010, 18:06   #4
BHPian
 
jealousdiamond's Avatar
 
Join Date: Apr 2009
Location: Pune
Posts: 268
Thanked: 104 Times
Default

Quote:
Originally Posted by aristocratic50 View Post
Hello,

Once I switch off ignition, I feel brake is not working!
Ravi
Ravi , It actually stops working and that is the way it is supposed to work . The aseembly is vaccum assisted and stops functioning once the engine is shut
jealousdiamond is offline   Reply With Quote
Old 20th January 2010, 18:15   #5
BHPian
 
vvvinod's Avatar
 
Join Date: Nov 2007
Location: Bangalore
Posts: 192
Thanked: 9 Times
Default How Power Brakes Work

Quote:
Originally Posted by aristocratic50 View Post
Hello,

I own an i20 1.2 Asta. I am facing a peculiar problem with brake. Once I switch off ignition, I feel brake is not working! After switching off ignition, if I press and release brake pedal around 3 times, it gets tightened. When I tried to apply a lot of force, brake pedal didn't move. And then I loose braking!! I rechecked this by keeping my car on a slightly inclined surface. Did any of the i20 owners face this problem?

Ravi
Ravi,

Please go through this thread

HowStuffWorks "How Power Brakes Work"
vvvinod is offline   Reply With Quote
Old 20th January 2010, 18:21   #6
Senior - BHPian
 
revtech's Avatar
 
Join Date: Nov 2004
Location: Bombay
Posts: 1,988
Thanked: 35 Times
Default

all assisted brakes work this way.brake pedal becomes extremely hard.its absolutely normal.
revtech is offline   Reply With Quote
Old 20th January 2010, 18:22   #7
Senior - BHPian
 
wildon's Avatar
 
Join Date: Jul 2007
Location: Bangalore
Posts: 2,405
Thanked: 1,040 Times
Default

Here is a clip from the i20 Manual about Power brakes
Attached Thumbnails
i20 brakes - problem when ignition is off-brakes_p01.jpg  

wildon is offline   Reply With Quote
Old 20th January 2010, 18:36   #8
Senior - BHPian
 
sammyboy's Avatar
 
Join Date: Jul 2006
Location: Gurgaon/Doon
Posts: 1,738
Thanked: 338 Times
Default

Ravi, I hope you read the information provided by other bhipans here before you try to coast down a slope with the ignition off.
sammyboy is offline   Reply With Quote
Old 20th January 2010, 18:44   #9
BHPian
 
Roy.S's Avatar
 
Join Date: Oct 2008
Location: Bangalore
Posts: 484
Thanked: 93 Times
Default

Quote:
Originally Posted by sammyboy View Post
Ravi, I hope you read the information provided by other bhipans here before you try to coast down a slope with the ignition off.
I hate to admit this but I have done it. It was '95 (I think) I had no idea about brake boosters. Borrowed my friend's Zen for the day. Had a good time driving it around Bangalore and finally while parking it figured I may as well switch off the engine, coast down the ramp and halt. Needless to say the brakes died and if I had not pulled the handbrake in time it would be 'wall, meet car'.
Roy.S is offline   Reply With Quote
Old 20th January 2010, 18:52   #10
Team-BHP Support
 
Samurai's Avatar
 
Join Date: Jan 2005
Location: B'lore-Manipal
Posts: 22,383
Thanked: 14,304 Times
Default

Coasting with ignition off was a routine trick in the old days when front drum brakes were the norm, I used to see it done all the time. But most modern cars come with brakes boosters and disc brakes, time to kick the old habit.
Samurai is offline   Reply With Quote
Old 20th January 2010, 18:56   #11
Senior - BHPian
 
sammyboy's Avatar
 
Join Date: Jul 2006
Location: Gurgaon/Doon
Posts: 1,738
Thanked: 338 Times
Default

Quote:
Originally Posted by Samurai View Post
Coasting with ignition off was a routine trick in the old days when front drum brakes were the norm, I used to see it done all the time. But most modern cars come with brakes boosters and disc brakes, time to kick the old habit.
+1 to that

Quote:
Originally Posted by Roy.S View Post
I hate to admit this but I have done it. It was '95 (I think) I had no idea about brake boosters. Borrowed my friend's Zen for the day. Had a good time driving it around Bangalore and finally while parking it figured I may as well switch off the engine, coast down the ramp and halt. Needless to say the brakes died and if I had not pulled the handbrake in time it would be 'wall, meet car'.
Yeah bro, I know it happens thats why I was hoping he has read the comments here. One of my friends got a new esteem many years ago and while coming back from a drive turned the ignition off, as the road was had a gentle slope for quite a distance, like we did on our bikes. The steering locked and the brakes didnt work, thankfully he was able to use the handbrake too as the speed wasnt high.

Last edited by sammyboy : 20th January 2010 at 19:02. Reason: add
sammyboy is offline   Reply With Quote
Old 20th January 2010, 19:04   #12
Senior - BHPian
 
DCEite's Avatar
 
Join Date: Sep 2004
Location: NCR
Posts: 3,045
Thanked: 476 Times
Default

No problem mate, even my 6 yr old WagonR exhibits this. Reasons others have already outlined.
DCEite is offline   Reply With Quote
Old 20th January 2010, 22:15   #13
Senior - BHPian
 
vigsom's Avatar
 
Join Date: Feb 2006
Location: AUH<->MAA
Posts: 1,722
Thanked: 581 Times
Default

in fact all cars with brake boosters(vacuum assisted) exhibit this behaviour
vigsom is offline   Reply With Quote
Old 21st January 2010, 09:42   #14
Newbie
 
Join Date: Aug 2009
Location: Bangalore
Posts: 8
Thanked: 0 Times
Default

Thanks guys.
I tought my ABS is behaving abnormally
aristocratic50 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
Alto Trip Meter Resets to 0 on Turning Off Ignition yikes6633 Technical Stuff 4 6th September 2010 12:52
Retarder in Volvo B7R buses (air-brakes / jake brakes) sfilinto Commercial Vehicles 12 30th March 2010 00:55
Ignition Key Esteem VX 2001 - comes off even when engine is on dev_kudle Technical Stuff 17 25th November 2009 13:59
Why diesel engines are revved before switching ignition off? DCEite Technical Stuff 57 7th May 2008 00:53
HU switches off during ignition zakaaaaasss In-Car Entertainment 38 10th July 2007 13:31


All times are GMT +5.5. The time now is 04:45.

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