Soft Pedal and hissing from e30 brake
Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: BMW 3 Series
Forum Discription: This forum will deal with any issues on the BMW 3 Series (E21, E30, E36, E46, E90, E91 & E92)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=23908
Printed Date: 08-May-2024 at 18:16
Topic: Soft Pedal and hissing from e30 brake
Posted By: Pete330
Subject: Soft Pedal and hissing from e30 brake
Date Posted: 04-November-2005 at 16:36
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My brake pedal in fairly soft in my e30 316 compared to my 98 e36 Are the pedals on e30`s soft? (Travel far) Also when sitting idle when you press the brakes there is an air (hiss) sound from passanger side If you turn engine off and pump pedal this sounds for around 4 times then pedal gets hard and there is no sound When you restert the engine with foot on brake the pedal goes down a bit and it makes the Hiss noise Is this normal? |
Replies:
Posted By: madman
Date Posted: 05-November-2005 at 12:48
Hi mate sounds to me like your vacuum servo diaphragm or your non return valve which connects from your inlet manifold to the servo 
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Posted By: Pete330
Date Posted: 05-November-2005 at 19:24
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well apparantly the sound is normal according to the guys of e30 zone ------------- Previous: E36 318is coupe, E36 323i coupe, E30 316 saloon, E30 318 saloon, E46 330ci Sport Conv E92 325d M Sport(3.0),With Loads of gadgets Current: 116i Sport F20 |
madman wrote:
Posted By: madman
Date Posted: 05-November-2005 at 19:32
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Hi PETE try the same thing that your local mot tester would check to see if your servo is working or not depress the brake pedal several times then start your engine the pedal should start to sink a bit other thing you could do it will make the engine sound a bit rough while your testing it disconnect the pipe from the vacuum unit and see if it changes anything of course this is only a suggestion hope this helps as a slight split in your vacuum will most likely sound as if you got a snake in there
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Posted By: jamie (e39)528i
Date Posted: 06-November-2005 at 13:36
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Pete i had a e30 316 1988 e reg and the brake pedal was a little soft and did travel a bit i was told it was a characteristic of the car. You can adjust the shoes at the back which will bring the pedal travel a bit higher. Hope this helps jamie
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Posted By: Madrab
Date Posted: 07-November-2005 at 10:20
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Mine does this too, slightly un-nerving until you realise that everything looks fine and the brakes work fine. Pedal may be soft due to really old brake fluid or air that needs bled out, they are susceptible to this. Fluid change and bleed every 2 years is recommended. ROb ------------- 1990 E3o 325i Touring and she's definately a she! Pain in the ass sometimes but goes like a bunny :oD |
Posted By: kbannon
Date Posted: 07-November-2005 at 10:26
Aren't they self adjusting? ------------- Current: 2009 E60 520d "Sport" tractor Previous: 1989 E30 320i SE 1997 E39 523i 2003 E39 525i Sport Individual |
Posted By: b318isp
Date Posted: 10-November-2005 at 08:39
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This is normal. With drum brakes you get this initial travel. Try standard hard on the brakes (when stationary) to try and get the rear adjusters to move a cog or two. ------------- 
http://www.esatclear.ie/~bpurcell/index.html - My E30 318is Site |
Posted By: LuxAuto
Date Posted: 12-November-2005 at 16:59
The last pragraph indictaes that your brakes and servo are working correctly. If you have a lot of travel on the pedal, change your brake fluid. This can help sometimes but not always. If after bleeding the brakes you find the pedal to be the same, your master cyinder is probably worn. Badly adjusted drum brakes can cause excessive pedal travel and although drum brkaes might be self adjusting, are you sure they are working? Finally, some cars, especially older designs have excessive pedl travel from the factory, unless you know that brakes on these cars didn;t suffer from these probelm, you should bear that in mind. |