Brake Pedal Firm on Start (Pedal does not depress)
02-12-2010 | 05:26 AM
#1
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Joined: Mar 2006
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In the past, when starting the car, pressure to the brake pedal would result in the pedal depressing as it normally does when the brakes are applied during driving. Recently, when starting the car, the brake pedal is firm and will not depress at all until after the car is started. Brakes seem to work normally while driving. Has anyone had this issue? Does this indicate a problem?
02-12-2010 | 05:36 AM
#2
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Its one of the following I'm pretty sure:
1. Brake booster
2. Master cylinder
3. Expansion tank
4. Vacuum hose
Below is the link to the document which explains how to change these parts. I recently experienced the same brake issue, but my car wouldn't stop as easily and I had to apply harder pressure to the brake pedal....pretty scary. Take it to a mechanic and let them tell you what exactly the problem is then if you're up to it you can change those parts yourself.
https://5series.net/forums/index.php...mage&img=17568
Good luck, and safe motoring.
1. Brake booster
2. Master cylinder
3. Expansion tank
4. Vacuum hose
Below is the link to the document which explains how to change these parts. I recently experienced the same brake issue, but my car wouldn't stop as easily and I had to apply harder pressure to the brake pedal....pretty scary. Take it to a mechanic and let them tell you what exactly the problem is then if you're up to it you can change those parts yourself.
https://5series.net/forums/index.php...mage&img=17568
Good luck, and safe motoring.
02-12-2010 | 08:14 AM
#3
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Joined: Oct 2006
Posts: 518
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From: Colorado USA
My Ride: 2004 545i, 6-speed Manual, Silver Grey Metallic, Grey Dakota Leather, Cold Weather Pkg, Premium Sound Pkg, Sport Pkg, Lumbar Support
Mine has done this since I bought it, but only after the car has been sitting for several hours. Less than that and the vacuum is still there and the pedal depresses normally. I assumed it was normal that the vacuum assist just goes away over time and don't worry about it.
With the MT, I don't have to push the brake during start very often anyway. Sometimes on inclines I have push it to keep the car from rolling because I don't set my parking brake very hard. Once I popped the handbrake cable off the lever and don't want to do that again.
With the MT, I don't have to push the brake during start very often anyway. Sometimes on inclines I have push it to keep the car from rolling because I don't set my parking brake very hard. Once I popped the handbrake cable off the lever and don't want to do that again.
02-12-2010 | 10:22 AM
#5
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From: St. Louis Burbs, USA
My Ride: 2007 530i. Purchased 6/28/07. Titanium Silver Metallic, Black Dakota Leather, Dark Poplar Trim, Steptronic, Premium Package, Cold Weather Package, Bluetooth, Adaptive Control Xenons. 10/30/07 Added OEM 124s with 245/40/18 & 275/35/18 Michelin Pilot Sport A/S tires. Installed red Cal Covers� from BavAuto. 11/21/07 Added OEM all-weather floor mats (for winter, carpet in summer) and coat rack. 6/26/08 installed M5-style rear spoiler. 6/30/08 put on red reflectors. 8/22/08 Euro turn signal stickers applied. 3/20/09 Installed Shadowline Trim. 3/27/09 Added Matte Black Kidney Grilles from Trinity. 4/03/09 Installed Bimmian Shadow Matte Black 530i Badges. 4/04/09 Installed LED license plate lights from Trinity. 5/01/09 Installed Brabus Interior LED Kit and White Angel Eyes. 5/02/09 Put in Brabus 6K Fogs. 5/14/09 Removed charcoal filter. 5/15/09 Installed light smoke LED side marker lamps from Trinity. 5/21/09 Sprint Booster. 6/12/09 Painted exhaust tips flat black. 6/13/09 Pulled red Cal Covers and painted calipers low gloss black. 6/27/09 RPI Ram Air Scoop from Trinity. 8/15/09 Installed Brabus's silver invisibulbs front and rear. 9/24/09 Installed R-Dash license plate LEDs from Brabaus (John).
It's fine. I asked my SA when I first got the car.
02-12-2010 | 02:43 PM
#8
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From: Toronto, Canada
My Ride: 2012 535i X-driveSpace Grey/Black Dakota, Fineline Anthracite Trim; Executive Package (Rear View, Lumbar, Nav, Voice, SIRIUS, HiFi Pro) Technology Package (Hi Beam Assist, Lane Departure, Blind Spot Detection, Surround View) BMW Apps (Apps, Smart Pho
Model Year: 2012
I've only had my 08 535i since July 09 but it has been that way since day one. As soon as the car starts the brakes act normally. The car does usually sit a while between startups.
02-12-2010 | 09:34 PM
#9
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Joined: Jul 2007
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From: Saint Louis, Missouri, USA
My Ride: 2010 535i M Sport 6MT
Model Year: 2010
Sounds like a slow vacuum leak somewhere. The E90 has a SIB on this, but the E60 does not.
Example E90 SIB:
Additional Effort Required to Press Brake Pedal Prior to Engine Initial Start
Example E90 SIB:
Additional Effort Required to Press Brake Pedal Prior to Engine Initial Start
