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Pete330 
Really Senior Member II
Joined: 26-November-2003
Location: Aberdeen
Status: Offline
Points: 8969
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 Topic: Soft Pedal and hissing from e30 brake
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?
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madman
Senior Member II
Joined: 26-July-2005
Location: WEST SUSSEX
Status: Offline
Points: 224
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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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Pete330
Really Senior Member II
Joined: 26-November-2003
Location: Aberdeen
Status: Offline
Points: 8969
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Posted: 05-November-2005 at 19:24 |
 madman wrote:
Hi mate sounds to me like your vacuum servo diaphragm or your non return valve which connects from your inlet manifold to the servo |
well apparantly the sound is normal according to the guys of e30 zone
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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
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madman
Senior Member II
Joined: 26-July-2005
Location: WEST SUSSEX
Status: Offline
Points: 224
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Posted: 05-November-2005 at 19:32 |
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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jamie (e39)528i
Really Senior Member II
Joined: 03-January-2005
Location: chafford hundred essex
Status: Offline
Points: 1093
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Posted: 06-November-2005 at 13:36 |
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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Madrab
Really Senior Member II
Joined: 21-November-2003
Location: Scotland
Status: Offline
Points: 569
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Posted: 07-November-2005 at 10:20 |
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
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1990 E3o 325i Touring and she's definately a she! Pain in the ass sometimes but goes like a bunny :oD
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kbannon
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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Posted: 07-November-2005 at 10:26 |
jamie (e39)528i wrote:
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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Aren't they self adjusting?
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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b318isp
Moderator Group
Joined: 10-October-2002
Location: Ireland
Status: Offline
Points: 2057
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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.
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LuxAuto
Senior Member II
Joined: 10-April-2005
Status: Offline
Points: 225
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Posted: 12-November-2005 at 16:59 |
pete323 wrote:
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? |
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.
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Soft Pedal and hissing from e30 brake