ZT Brake Problem

Skud Kid · 29th October 2007, 13:12

I sometimes have to really push hard on the brakes for them to start working, the pedal feels very hard then all of a sudden the pedal will move a inch or so and the car starts braking as normal

Is this air in the system or something or has anyone had this problem

I changed the pads last week but i did that because of this issue but when i removed the old pads there was loads of meat still left on them, as a matter of course i changed them anyway

steve00117 · 29th October 2007, 14:17

Would try bleeding them first, but it sounds like a Master Cylinder problem to me, sure someone else will be along soon to help.

T-Cut · 29th October 2007, 14:42

Also check the calipers to confirm that the pistons are moving properly and that the sliding half is moving freely on the guide pins. Notice of one pad is worn more than the other. It's a good check for sticking calipers. If the caliper is operating normally, both pads will have about the same friction pad thickness.

TC

Skud Kid · 29th October 2007, 14:55

When i removed the pads they had worn evenly and when fitting the new pads the piston were very easy to push back

Keith · 29th October 2007, 15:09

Servo?

Iirc the cdt has a vacuum pump for the servo at the battery end is the hose ok?

you could try clamping the hose and see if the brakes are the same i.e hard which could suggest no servo assistance but keep your distance from anything in front!

Skud Kid · 29th October 2007, 15:31

Is that only on the CDT cos i have the KV6 ?

There is assistance but you have to press hard then it all of a sudden works, feels like it could be compressing the air then once its done that it works but im no mechanic

GreyGhost · 29th October 2007, 16:25

I'm not familiar with the workings of modern servo systems, is this electronically switched or could it be a faulty valve sticking, or both?

Paranoid Carlos · 29th October 2007, 16:47

I would thoroughly check the pipe from servo to inlet manifold, a split or rubbing hose would be my first guess.
Not sure of the routing on the v6 though sorry.

Paranoid Carlos · 29th October 2007, 16:52

http://www.the75andztclub.co.uk/foru...ighlight=servo

Keith · 29th October 2007, 17:20

Sorry skud brain dead I thought you had a weasel!
Same theory though find the hose check for problems etc on the KV6 it connects to the manifold by the Vis motors

29th October 2007, 13:12	#1
Skud Kid Regular poster MG ZT MK1 KV6 160+ Join Date: Nov 2006 Posts: 86 Thanks: 0 Thanked 0 Times in 0 Posts	ZT Brake Problem I sometimes have to really push hard on the brakes for them to start working, the pedal feels very hard then all of a sudden the pedal will move a inch or so and the car starts braking as normal Is this air in the system or something or has anyone had this problem I changed the pads last week but i did that because of this issue but when i removed the old pads there was loads of meat still left on them, as a matter of course i changed them anyway __________________ Rhythm is part of our daily life. It is the pulse that drives us, the steady beat that provides vitality and motion

29th October 2007, 14:55	#4
Skud Kid Regular poster MG ZT MK1 KV6 160+ Join Date: Nov 2006 Posts: 86 Thanks: 0 Thanked 0 Times in 0 Posts	When i removed the pads they had worn evenly and when fitting the new pads the piston were very easy to push back __________________ Rhythm is part of our daily life. It is the pulse that drives us, the steady beat that provides vitality and motion

29th October 2007, 15:31	#6
Skud Kid Regular poster MG ZT MK1 KV6 160+ Join Date: Nov 2006 Posts: 86 Thanks: 0 Thanked 0 Times in 0 Posts	Is that only on the CDT cos i have the KV6 ? There is assistance but you have to press hard then it all of a sudden works, feels like it could be compressing the air then once its done that it works but im no mechanic __________________ Rhythm is part of our daily life. It is the pulse that drives us, the steady beat that provides vitality and motion

29th October 2007, 16:47	#8
Paranoid Carlos Posted a thing or two Starlight CDT Conn SE Join Date: Nov 2006 Location: Erdington, Birmingham Posts: 1,057 Thanks: 0 Thanked 0 Times in 0 Posts	I would thoroughly check the pipe from servo to inlet manifold, a split or rubbing hose would be my first guess. Not sure of the routing on the v6 though sorry. __________________ [SIGPIC][/SIGPIC]

29th October 2007, 16:52	#9
Paranoid Carlos Posted a thing or two Starlight CDT Conn SE Join Date: Nov 2006 Location: Erdington, Birmingham Posts: 1,057 Thanks: 0 Thanked 0 Times in 0 Posts	http://www.the75andztclub.co.uk/foru...ighlight=servo __________________ [SIGPIC][/SIGPIC]

29th October 2007, 14:17	#2
steve00117 Avid contributor 75 Saloon Con SE 2.0V6 Join Date: Jun 2007 Location: Oop North Posts: 134 Thanks: 0 Thanked 0 Times in 0 Posts	Would try bleeding them first, but it sounds like a Master Cylinder problem to me, sure someone else will be along soon to help.

29th October 2007, 14:42	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Also check the calipers to confirm that the pistons are moving properly and that the sliding half is moving freely on the guide pins. Notice of one pad is worn more than the other. It's a good check for sticking calipers. If the caliper is operating normally, both pads will have about the same friction pad thickness. TC

29th October 2007, 15:09	#5
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Servo? Iirc the cdt has a vacuum pump for the servo at the battery end is the hose ok? you could try clamping the hose and see if the brakes are the same i.e hard which could suggest no servo assistance but keep your distance from anything in front!

29th October 2007, 16:25	#7
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	I'm not familiar with the workings of modern servo systems, is this electronically switched or could it be a faulty valve sticking, or both?

29th October 2007, 17:20	#10
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Sorry skud brain dead I thought you had a weasel! Same theory though find the hose check for problems etc on the KV6 it connects to the manifold by the Vis motors