MINI2

lucachiarelli · Sep 30th, 2007, 04:43 PM

Hi everyone.
I fitted my bbk last night. This morning i took it out on the motorway and noticed when braking slightly the steering wheel shakes up and down. also the brake pedal has more travel than it used to before the car starts braking. Any ideas?
Only seems to happen when braking from speeds of 50 mph upwards.

MartinSSZ · Oct 1st, 2007, 07:01 AM

Check the wheel nuts are tight...

Rigsey · Oct 1st, 2007, 07:42 AM

Quote: Originally Posted by MartinSSZ (original)

Check the wheel nuts are tight...

Agree, but also check they are no over tight; I believe they should be 120Nm.

I've also noticed that the MINI is very sensitive to slight wheel imbalances so it maybe worth getting that checked.

ohsoblue · Oct 1st, 2007, 08:31 AM

Does the brake pedal also feel like it's 'pulsing' under your foot when you apply pressure ? Could be warped discs - they will transmit vibration back through the steering also.

ALD0 · Oct 1st, 2007, 08:55 AM

Also the wheels may need balancing...

lucachiarelli · Oct 1st, 2007, 08:56 AM

Quote: Originally Posted by ohsoblue (original)

Does the brake pedal also feel like it's 'pulsing' under your foot when you apply pressure ? Could be warped discs - they will transmit vibration back through the steering also.

Nothing through the pedal when braking. I also noticed that when i press the brakes harder the vibrations go away. Im going to check for any high spots on the hub, tighten the wheelbolts up and balance them if they are out. If this fails i will get the discs looked at.

Capsaisin · Oct 1st, 2007, 02:32 PM

Brake pedal distance will increase because you have more pots on your calipers, hence need to supply a bigger volume of brake fluid to apply braking.

Certainly sounds like something is off balance.

Did you make sure that all mating surfaces were clean and free from high spots. If not the disc or caliper could be slightly off square.

You should check for run-out visually by rotating the disc and observing if it appears to move relative to the caliper and pad. If you have one, you could use a dial gauge on the disc.

Check if there is any apparent difference in movement between the LH and RH sides.

MINI-Morgan · Oct 2nd, 2007, 11:09 AM

What he said ^^^

Doesnt sound like wheels but more discs not being sat dead straight. I wonder if when you brake harder the pistons are following the profile of the discs.....

lucachiarelli · Oct 2nd, 2007, 11:14 AM

My mate works for mercedes. So hes going to get it on the ramps there and check for any highspots on the hub or discs. He has some sort of digital thing that checks for highspots on discs. Not sure what its called.
Its going in on saturday so hopefully will find the problem.
Going to balance my wheels and do tracking aswell.

lucachiarelli · Oct 6th, 2007, 12:42 PM

Had my car on the ramps today.
Ive balanced the wheels as they were out and bled the brakes again.
The steering wheel still shakes slightly under light braking at high speeds. Im going to check for flat spots where the disc sits.
The brake pedal has far less travel now for braking which feels much better.

ScottyBoy · Oct 6th, 2007, 12:58 PM

He luca,

My car also does this since i had the AP kit fitted, i think my discs may be warped, ive got a 2nd set of discs and need some new pads soon so ill change everything and see what happends.

lucachiarelli · Oct 6th, 2007, 01:35 PM

I thought mine were warped but the guy who i got them off had the same problem and had the discs checked and they were ok. Im going to check for high spots where the disc sits on the hub and file it. I dont get anything through the pedal when i brake so im not sure if they are warped. When dics are warped you get the steering wheel shake and the pedal.
Let me know what happens with yours.
Good luck.

Should be getting the new t map sensor on tuesday so hopefully will stop all eml lights coming on. If not ill have to get a diagnostics check.
Hopefully nothing serious.

Sep 30th, 2007, 04:43 PM	#1
lucachiarelli Banned My Classifieds Join Date: Aug 2007 Location: darwen Local Time: 08:28 AM Posts: 516 Offline	vibrating steering wheel at 60 + Hi everyone. I fitted my bbk last night. This morning i took it out on the motorway and noticed when braking slightly the steering wheel shakes up and down. also the brake pedal has more travel than it used to before the car starts braking. Any ideas? Only seems to happen when braking from speeds of 50 mph upwards.

Oct 1st, 2007, 07:42 AM	#3 (permalink)
Rigsey MINI2 Senior My Classifieds Join Date: Nov 2003 Location: Kent Local Time: 08:28 AM Posts: 515 Offline	Quote: Originally Posted by MartinSSZ (original) Check the wheel nuts are tight... Agree, but also check they are no over tight; I believe they should be 120Nm. I've also noticed that the MINI is very sensitive to slight wheel imbalances so it maybe worth getting that checked. GTT, GRS, Janspeed, JCW, OMP + various other bits - 232.6bhp, 191.2lbft on 1320's rolling road

Oct 2nd, 2007, 11:09 AM	#8 (permalink)
MINI-Morgan MINI Obsessed... My Classifieds Join Date: Nov 2003 Location: Southampton, Hants Local Time: 08:28 AM Posts: 4,611 Offline	What he said ^^^ Doesnt sound like wheels but more discs not being sat dead straight. I wonder if when you brake harder the pistons are following the profile of the discs..... One Man, One Project......find out what happens next at MINIProject.co.uk For MINIs in the south it can only be South Coast New MINI Club

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Oct 1st, 2007, 07:01 AM	#2 (permalink)
MartinSSZ Yellow and Proud My Classifieds Join Date: Nov 2002 Location: Shoreham-by-Sea Local Time: 08:28 AM Posts: 785 Offline	Check the wheel nuts are tight...

Oct 1st, 2007, 08:31 AM	#4 (permalink)
ohsoblue Always lurking <div><a href= Join Date: Aug 2006 Location: On The Edge Local Time: 08:28 AM Posts: 4,221 Offline	Does the brake pedal also feel like it's 'pulsing' under your foot when you apply pressure ? Could be warped discs - they will transmit vibration back through the steering also.

Oct 1st, 2007, 08:55 AM	#5 (permalink)
ALD0 MINI2 Master My Classifieds Join Date: Jun 2003 Location: Chester Local Time: 08:28 AM Posts: 9,434 Offline	Also the wheels may need balancing...

Oct 1st, 2007, 08:56 AM	#6 (permalink)
lucachiarelli Banned My Classifieds Join Date: Aug 2007 Location: darwen Local Time: 08:28 AM Posts: 516 Offline	Quote: Originally Posted by ohsoblue (original) Does the brake pedal also feel like it's 'pulsing' under your foot when you apply pressure ? Could be warped discs - they will transmit vibration back through the steering also. Nothing through the pedal when braking. I also noticed that when i press the brakes harder the vibrations go away. Im going to check for any high spots on the hub, tighten the wheelbolts up and balance them if they are out. If this fails i will get the discs looked at.

Oct 1st, 2007, 02:32 PM	#7 (permalink)
Capsaisin cave capsicum Join Date: Mar 2006 Location: Crewe Local Time: 08:28 AM Posts: 3,367 Offline	Brake pedal distance will increase because you have more pots on your calipers, hence need to supply a bigger volume of brake fluid to apply braking. Certainly sounds like something is off balance. Did you make sure that all mating surfaces were clean and free from high spots. If not the disc or caliper could be slightly off square. You should check for run-out visually by rotating the disc and observing if it appears to move relative to the caliper and pad. If you have one, you could use a dial gauge on the disc. Check if there is any apparent difference in movement between the LH and RH sides.

Oct 2nd, 2007, 11:14 AM	#9 (permalink)
lucachiarelli Banned My Classifieds Join Date: Aug 2007 Location: darwen Local Time: 08:28 AM Posts: 516 Offline	My mate works for mercedes. So hes going to get it on the ramps there and check for any highspots on the hub or discs. He has some sort of digital thing that checks for highspots on discs. Not sure what its called. Its going in on saturday so hopefully will find the problem. Going to balance my wheels and do tracking aswell.

Oct 6th, 2007, 12:42 PM	#10 (permalink)
lucachiarelli Banned My Classifieds Join Date: Aug 2007 Location: darwen Local Time: 08:28 AM Posts: 516 Offline	Had my car on the ramps today. Ive balanced the wheels as they were out and bled the brakes again. The steering wheel still shakes slightly under light braking at high speeds. Im going to check for flat spots where the disc sits. The brake pedal has far less travel now for braking which feels much better.

Oct 6th, 2007, 12:58 PM	#11 (permalink)
ScottyBoy Obsessive Car Cleaner OCC My Classifieds Join Date: Jul 2006 Location: Thornaby NE Local Time: 08:28 AM Posts: 2,873 Offline	He luca, My car also does this since i had the AP kit fitted, i think my discs may be warped, ive got a 2nd set of discs and need some new pads soon so ill change everything and see what happends.

Oct 6th, 2007, 01:35 PM	#12 (permalink)
lucachiarelli Banned My Classifieds Join Date: Aug 2007 Location: darwen Local Time: 08:28 AM Posts: 516 Offline	I thought mine were warped but the guy who i got them off had the same problem and had the discs checked and they were ok. Im going to check for high spots where the disc sits on the hub and file it. I dont get anything through the pedal when i brake so im not sure if they are warped. When dics are warped you get the steering wheel shake and the pedal. Let me know what happens with yours. Good luck. Should be getting the new t map sensor on tuesday so hopefully will stop all eml lights coming on. If not ill have to get a diagnostics check. Hopefully nothing serious.

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