Hi all, I'm hoping you can help me identify an annoying symptom that's occurring in my 58 Octavia 1.9 TDi Estate.

 

When I start her up I notice a hissing noise that appears to be coming from the brake pedal area. When I apply the brakes the hissing disappears then as soon as I let off it returns. There is no loss of braking performance (Yet) but I've been doing a bit of research and it seems it may be a problem with the Servo. I was wondering if any of you had encountered the same problem before and could advise me if I need to have the entire servo unit replaced or whether it could just be a leaky hose or something. 

 

Also I would ask if I did have to replace the Servo would it be stupid to buy a used one from ebay or other retailer? I'm a family man and need to try and save money where I can but don't want to cut corners.

 

One final question would be, does anyone know of a reputable mechanic in the Canterbury, Kent area?

 

My mechanic is a top bloke but he's a mate and doesn't do receipts or anything. I really want to keep the service history in top condition with my new Octavia so I'm looking for a garage I can use so I have proof of works carried out. This also means I would be able to go back if there were any issues with the work done without straining a friendship.

 

Thanks in advance Guys.

Kind regards,

 

Skinz72

Mine's done it for 7 years and counting.....

Hi TKW. I've been told you would be the person to talk to about having my car scanned with the VCDS code scanner. Would this be true.?

My 07 octavia 2.0 tdi had this problem for the 3 years i owned it, i tracked it down to a small air leak where the air supply hose fitted in, the small 1 way valve was the culprit, never ever caused a problem with the operation of the servo or the brakes so left it.

 

Me being an MOT tester if it did start causing a problem it would have been rectified but as i say it never did. 

 

If your brake pedal does start to get difficult to press check this first and then check the vacum pump, diesel's don't produce enough vacum in the inlet manifold so need a pump to do this, on the 1.9 and 2.0 pd engines it's called a tandem pump as it's also a fuel pump for the injection system. Very rare for modern servos's to be at fault now.

On 11/02/2017 at 08:31, Skinz72 said:

 

Cheers for that Ju1ian1001, it Helps to ease my concern a bit.

On Friday, March 17, 2017 at 18:02, Ju1ian1001 said:

My 07 octavia 2.0 tdi had this problem for the 3 years i owned it, i tracked it down to a small air leak where the air supply hose fitted in, the small 1 way valve was the culprit, never ever caused a problem with the operation of the servo or the brakes so left it.

 

Me being an MOT tester if it did start causing a problem it would have been rectified but as i say it never did. 

 

If your brake pedal does start to get difficult to press check this first and then check the vacum pump, diesel's don't produce enough vacum in the inlet manifold so need a pump to do this, on the 1.9 and 2.0 pd engines it's called a tandem pump as it's also a fuel pump for the injection system. Very rare for modern servos's to be at fault now.

I've a similar issue at the moment. When the engine is off, the break pedal feels fine in operation. However, with the engine running, operation of the pedal feels spongy and travels quite a long way down. If you pump the pedal a couple of times, there is far less travel. There is no warning indication, and I can't hear any hiss. It passed the mot with no issues and the garage have checked it all out. Your mention of a loose air hose maybe the cause as if I press the pedal continuously, it gradually goes down until its as low as itcan go. Breaks still work out on the road, but would like to know likely issues and investigate further if possible. Wherabouts is the one valve you mention, I know ive a 59 fl but is it going to be in a similar area.

Just now, Canders said:

I've a similar issue at the moment. When the engine is off, the break pedal feels fine in operation. However, with the engine running, operation of the pedal feels spongy and travels quite a long way down. If you pump the pedal a couple of times, there is far less travel. There is no warning indication, and I can't hear any hiss. It passed the mot with no issues and the garage have checked it all out. Your mention of a loose air hose maybe the cause as if I press the pedal continuously, it gradually goes down until its as low as itcan go. Breaks still work out on the road, but would like to know likely issues and investigate further if possible. Wherabouts is the one valve you mention, I know ive a 59 fl but is it going to be in a similar area.

The brake pedal in diesel will creep, it's normal, if the brakes are performing well  whilst driving normally then don't worry, if however the pedal hit's the deck whilst driving then there is a problem, it's normally the hydraulics that are at fault as there could be  air in the system.

1 hour ago, Ju1ian1001 said:

The brake pedal in diesel will creep, it's normal, if the brakes are performing well  whilst driving normally then don't worry, if however the pedal hit's the deck whilst driving then there is a problem, it's normally the hydraulics that are at fault as there could be  air in the system.

I've a problem methinks as swmbo's yeti is totally different and its diesel. As soon as you press the pedal, the brakes engage. Im going to get the brakes bled totally and the system checked as it feels as if theres a hydraulic issue as you've hinted at. It could be that a valve is passing somewhere, not an external leak, but somehow passing back into the system and not going to the breaks themselves.

40 minutes ago, Canders said:

I've a problem methinks as swmbo's yeti is totally different and its diesel. As soon as you press the pedal, the brakes engage. Im going to get the brakes bled totally and the system checked as it feels as if theres a hydraulic issue as you've hinted at. It could be that a valve is passing somewhere, not an external leak, but somehow passing back into the system and not going to the breaks themselves.

make sure they do a proper fluid change as a lot of garages just tend to suck the fluid out of the resevoir and refill, a proper fluid change should be all 4 corners bleed through, they curse me at work when i do a major because imake sure i do it this way, it take a wee bit longer but the results are fantastic brakes afterwards.

 

21 minutes ago, Ju1ian1001 said:

make sure they do a proper fluid change as a lot of garages just tend to suck the fluid out of the resevoir and refill, a proper fluid change should be all 4 corners bleed through, they curse me at work when i do a major because imake sure i do it this way, it take a wee bit longer but the results are fantastic brakes afterwards.

 

Cheers for the advice, much appreciated. Will make sure my indy does all 4 corners.