Tapping Thru Brake Pedal

ardvark · 11th September 2016, 14:45

As title says I had this tapping thru the brake pedal when braking.
A few weeks after that the brake pad light came on.
I changed the front pads and light went out but tapping still there.
The front discs seemed low so I changed them a few weeks later but tapping still there.
Any ideas?

T-Cut · 11th September 2016, 15:59

Does the 'tapping' frequency vary with road speed?

TC

ardvark · 13th September 2016, 18:46

Yes it does.
When I do about 5mph there is no tapping.
What do you think it is?

klarzy · 13th September 2016, 19:17

Are the mating surfaces between the disk and the hub real clean?
Do you have an ABS light at all?

T-Cut · 13th September 2016, 19:41

I'd suggest a good look at the discs/pads/calipers. There may be something on a disc surface causing the pad to be struck every revolution. I doubt it can be diagnosed without servicing the brakes.

TC

badrover · 13th September 2016, 19:55

If it only happens at low speed it will be an abs sensor.

wullie480 · 13th September 2016, 20:04

Check your alloys for buckles/flat spots,
I've lost count how many I've took to the tip this year with buckles/flat spots.
Got 2 new tyres the other day & both fronts have flat spots so will need to buy another set of alloys again.

klarzy · 13th September 2016, 20:08

Quote:

Originally Posted by badrover

If it only happens at low speed it will be an abs sensor.

if its once each rotation then if not warping I would say reluctor ring...

EastPete · 14th September 2016, 09:49

Quote:

Originally Posted by klarzy

if its once each rotation then if not warping I would say reluctor ring...

For my education, is the reluctor ring the round silver thing at the back of the wheel bearing just inside the hub flange, or is it the dark brown/black ring that the sensor tip sits over (which I thought might be an oil seal) ?. Where should the sensor tip be positioned for the ABS to work properly ?

Cheers

Pete

klarzy · 14th September 2016, 10:12

Quote:

Originally Posted by EastPete

For my education, is the reluctor ring the round silver thing at the back of the wheel bearing just inside the hub flange, or is it the dark brown/black ring that the sensor tip sits over (which I thought might be an oil seal) ?. Where should the sensor tip be positioned for the ABS to work properly ?

Cheers

Pete

its the ring in the bearing that the tip floats over...

11th September 2016, 14:45	#1
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	Tapping Thru Brake Pedal As title says I had this tapping thru the brake pedal when braking. A few weeks after that the brake pad light came on. I changed the front pads and light went out but tapping still there. The front discs seemed low so I changed them a few weeks later but tapping still there. Any ideas? __________________ ARDVARK

13th September 2016, 18:46	#3
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	Yes it does. When I do about 5mph there is no tapping. What do you think it is? __________________ ARDVARK

13th September 2016, 19:17	#4
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Are the mating surfaces between the disk and the hub real clean? Do you have an ABS light at all? __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

13th September 2016, 19:55	#6
badrover Gets stuck in 75 club se tourer,75 cdt tourer connie se, 75 dealer launch Join Date: Jan 2013 Location: cheshire Posts: 536 Thanks: 79 Thanked 97 Times in 73 Posts	If it only happens at low speed it will be an abs sensor. __________________ 1970 p6 v8 auto 1972 p6 v8 estate auto 1972 p6 v8 manual 1974 p6 2200 auto 1999 800 vitesse hatch 2001 club se cdt tourer 2004 club se tourer 1.8t auto 2017 skoda superb estate

13th September 2016, 20:04	#7
wullie480 This is my second home 1 Join Date: Dec 2010 Location: Banned Posts: 5,196 Thanks: 528 Thanked 1,022 Times in 786 Posts	Check your alloys for buckles/flat spots, I've lost count how many I've took to the tip this year with buckles/flat spots. Got 2 new tyres the other day & both fronts have flat spots so will need to buy another set of alloys again. __________________ [SIGPIC][/SIGPIC]

11th September 2016, 15:59	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Does the 'tapping' frequency vary with road speed? TC

13th September 2016, 19:41	#5
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I'd suggest a good look at the discs/pads/calipers. There may be something on a disc surface causing the pad to be struck every revolution. I doubt it can be diagnosed without servicing the brakes. TC