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BrianC



Member Since: 15 Apr 2009
Location: central belt
Posts: 1429
Scotland 
Engine management light and poor brakes

I replaced both rear calipers today and since then the brake pedal is sinking all the time and 5 minutes later the engine management light came on.
I'm not sure if these are a coincidence. The brakes were like this before i changed them but not as bad, I searched online a bit and Some say its a vacuum issue. The fault codes are p0171 and p0174 system to lean
Any ideas ?
Post #131514 16th Jul 2012 10:13pm
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stan
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sounds like they need bleeding again.. ... - .- -.




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Post #131544 17th Jul 2012 9:09am
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Contraband



Member Since: 08 Nov 2010
Location: FIFE
Posts: 3697
Scotland 

As stan says...... I would run half a bottle at least through each bleed valve to make sure air was out of the system. Previously..
Vogue SE TD6
Defender 90 2.4
Defender 110 TD5
Vogue 3.5 EFI

Post #131549 17th Jul 2012 9:20am
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daveo



Member Since: 21 Oct 2009
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start at the back first V8 facelift Range Rover Autobiography 22" wheels.
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Post #131650 17th Jul 2012 6:43pm
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Budgie



Member Since: 09 Jul 2012
Location: Stornoway
Posts: 267
Scotland 

What's the brake peddle like with the engine off?
Does it still sink or is it hard & with little movement?
If you keep the pressure on the peddle and start the engine, what happens to the peddle?

A handy "How Too": http://autorepair.about.com/od/troubleshooting/ss/ts_brakes.htm Wink 
Post #131652 17th Jul 2012 6:56pm
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BrianC



Member Since: 15 Apr 2009
Location: central belt
Posts: 1429
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The pedal is good when the car is off
I will bleed them better tommorrow night.
As for the fault codes, who knows it's getting looked at tommorrow
Post #131664 17th Jul 2012 8:20pm
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BrianC



Member Since: 15 Apr 2009
Location: central belt
Posts: 1429
Scotland 

Well I bled them properly tonight and they are now perfect. I think the air in the system caused the engine vacuum to be sending dodgy signals to the ecu and that was the cause of the engine management light to come on
Seems to be ok now Thumbs Up
Post #131880 18th Jul 2012 9:10pm
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stan
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Thumbs Up ... - .- -.




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Post #131883 18th Jul 2012 9:40pm
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Cam-Tech-Craig



Member Since: 04 Aug 2011
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Had to replace my rear calipers today too! Censored ! I hate spending money on my own cars... That and a new gearbox in my bobtail and this month is a bust!!! Thud


Craig Mad
Post #131916 18th Jul 2012 11:55pm
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jim2RRs



Member Since: 07 Feb 2012
Location: Genesee, Colorado
Posts: 147
United States 2005 Range Rover HSE 4.4 V8 Chawton White

daveo wrote:
start at the back first

FAIL.
RAVE wrote:
WARNING: Braking efficiency may be seriously impaired if the incorrect bleed sequence is used.

Bleed in this order
For LEFT HAND DRIVE:
Right Front
Left Front
Right Rear
Left Rear
For RIGHT HAND DRIVE:
Left Front
Right Front
Left Rear
Right Rear Jim
2000 NAS HSE
2005 NAS HSE
Post #131920 19th Jul 2012 6:09am
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BrianC



Member Since: 15 Apr 2009
Location: central belt
Posts: 1429
Scotland 

You only need to bleed the part of the system that you disturbed. As in front or back, then start at passenger side.
Post #131921 19th Jul 2012 6:36am
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