MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Gtcpaul1971 on August 12, 2019, 11:54:15 AM

Title: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: Gtcpaul1971 on August 12, 2019, 11:54:15 AM
So used the car this morning and all was fine.
Got back in this afternoon and started it up. Smell of petrol and the car really idling rough and over revving. So I took it down the street to find brake pedal was rock hard and it wasnt slowing the car - scary!
Although no lights on the dash, I Put on my cheap code reader and following came up -  08825 and 01393.
Are these PCV and brake switch I am  not sure?
Would the brake switch effect the brakes themselves?
Why would these two things go at exactly the same time?
Any help would be appreciated.
Title: Re: HELP - Suddenly rough idling / Surging / Petrol smell and hard brake pedal?
Post by: amanda on August 12, 2019, 11:57:25 AM
Was car slowing down as if wheels were locking up???????
Title: Re: HELP - Suddenly rough idling / Surging / Petrol smell and hard brake pedal?
Post by: Octoparrot on August 12, 2019, 12:55:14 PM
Sounds like you have a vacuum leak somewhere. No vacuum would prevent the brake servo from working properly hence the hard brakes and the resulting leak in the air intake system would cause the idling problems, have a good look around the engine for any split hoses etc.
Title: Re: HELP - Suddenly rough idling / Surging / Petrol smell and hard brake pedal?
Post by: titchy on August 12, 2019, 02:56:49 PM
check pipe from vac unit this has a take off for the brake booster a leak would cause this
Title: Re: HELP - Suddenly rough idling / Surging / Petrol smell and hard brake pedal?
Post by: Gtcpaul1971 on August 12, 2019, 04:33:47 PM
After spending hours digging I think it may be the brake booster hose?
I had a quick look at my car and it is covered in gunk and weeping down the pipe.
Anyone know how to change this ? I have the AXX engine.
Cheers
Title: Re: HELP - Suddenly rough idling / Surging / Petrol smell and hard brake pedal?
Post by: Gtcpaul1971 on August 12, 2019, 04:34:32 PM
Was car slowing down as if wheels were locking up???????


No the pedal was rock solid and barely slowing the car down
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: titchy on August 12, 2019, 07:01:48 PM
I have bwa theres a push on connector to vac pump theres a small insert in the pipe theres a metal clip to booster then theres another pipe to crankcase again another insert inside. T he pipe cost £33 from TPS it does not come with the inserts so be careful Hope this helps
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: Gtcpaul1971 on August 13, 2019, 08:01:27 AM
I have bwa theres a push on connector to vac pump theres a small insert in the pipe theres a metal clip to booster then theres another pipe to crankcase again another insert inside. T he pipe cost £33 from TPS it does not come with the inserts so be careful Hope this helps

Thanks for that. I am taking the cover off today for a better Inspection. vw and tps take 2 days to order
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: Gtcpaul1971 on August 13, 2019, 12:34:18 PM
Right took brake booster vacuum pipe off and could  not see any cracks or problem?
So am stumped. There was some oil around the pipes and in that area and nowhere else so it must be something around that area.
Could the pipe have failed internally that I can't see?
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: amanda on August 13, 2019, 12:52:06 PM
Right took brake booster vacuum pipe off and could  not see any cracks or problem?
So am stumped. There was some oil around the pipes and in that area and nowhere else so it must be something around that area.
Could the pipe have failed internally that I can't see?

Ok I am not an expert by any means but have you checked master cylinder or brake switch.......both give funny unexpected  faults when failing as I have found out before
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: titchy on August 13, 2019, 02:00:42 PM
check where the pipe goes into vac pump mine had a split there is also a one way valve which can fail
Title: Re: HELP - Suddenly rough idling l and hard brake pedal - Brake hose Booster?
Post by: Gtcpaul1971 on August 14, 2019, 03:10:05 PM
Yep it was the vacuum pipe, all sorted cheers