Hi all,

This happened twice in two days, after starting the car the first time in the day (ambient +-34C).

Video: https://www.reddit.com/r/rangeroversport/c...ake_pedal/

It doesn't happen after driving around and then starting the car again.

Any ideas? --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

I went past my mech yesterday, and he tightened the bolts on the brake booster. They were not loose, but there was some give in them.

Funnily enough, I saw the replies to my question on another two forums, and got similar replies.

Someone posted this TSB, which affects the booster, it may be helpful to others.

https://www.rrsport.co.uk/gallery/albums/u...6-9340.pdf --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

Reference: SSM72903
Models: Range Rover/ L405 Range Rover Sport/ L494
Title: Air Leak Noise When Brake Pedal Is Pressed
Category: Chassis
Last modified: 29-Jul-2016 00:00:00
Symptom: 301000 Service Brake System
Attachments: D7u Booster Fixings Secure Sequence.pdf (D7u Booster Fixings Secure Sequence.pdf)

Content
Issue:
Air-leak noise when brake pedal is pressed.

Cause:
Low or high clamp load on brake servo fixings.

Action:
If an air-leak noise is exhibited during brake pedal depression, then slacken the 4 fixings off and re-torque to 24Nm. Ensure when torquing you follow the pattern detailed in the
attachment.

Re-apply the torque (following the attached pattern) a second time 30 minutes later to ensure the fixings have not relaxed.

If the noise is still present then please progress with replacement of the component.


 --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

Ok, so the noise was present again today, so it looks like the brake booster needs to be replaced.

Although I've seen posts from others where thy have had the noise for years with no ill effects, so... --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ