Brake judder. New discs didn't solve it...

[FastEdd11e]

As a lover of petrol but one who has no clue for maintenance, I need your help.

Our Maserati Ghibli has an annoying brake judder for the drivers side rear wheel.
We changed the rear discs, no change.

What next?

Warped rim?

Your help is appreciated.

Thanks.

[Caddyshack]

I had this on a 911, felt like a front brake pad…it was actually a deformed rear tyre. We changed wheel bearings, bushes, discs, pads etc before the rear tyre was changed for track tyres which cured it, put the old back on and the brake judder came back.

Edited by Caddyshack on Wednesday 20th April 22:50

[kev b]

Might be worth checking the caliper piston and sliders are not seized or sticking.

[Caddyshack]

Don’t assume it is the rear causing it just because it feels like a rear.

You can measure disc run out with a dial gauge.

[stevemcs]

We have had it with a couple of BMW's, everything tells you its the rear as the vibration comes through the car, in fact it turned out to be the fronts.

[Kawasicki]

Phone a company with a wheel balancer with force variation measurement capability.

Make an appointment.

Tell them you want to measure the tyres without any short-term flatspots. This means they need to have an empty vehicle lift waiting for you when you arrive in your car. The car should go straight onto the lift, and the car should be lifted into the air as quickly as possible.

Drive for at least 40 minutes before you turn up at your appointment, ideally with some motorway miles. This is to warm the tyres and remove any short-term flatspots before your wheels are measured.

Get the 4 wheels measured for 1st harmonic radial force variation, tell them you want to get the print-outs as they were before they were force matched. If any of the wheel & tyre assemblies have a measurement over 80N then get them force matched to bring them under this figure. The wheels should be weight balanced too.

If the garage don’t understand your request, call another garage.

[blueg33]

Kawasicki said:

Phone a company with a wheel balancer with force variation measurement capability.

Make an appointment.

Tell them you want to measure the tyres without any short-term flatspots. This means they need to have an empty vehicle lift waiting for you when you arrive in your car. The car should go straight onto the lift, and the car should be lifted into the air as quickly as possible.

Drive for at least 40 minutes before you turn up at your appointment, ideally with some motorway miles. This is to warm the tyres and remove any short-term flatspots before your wheels are measured.

Get the 4 wheels measured for 1st harmonic radial force variation, tell them you want to get the print-outs as they were before they were force matched. If any of the wheel & tyre assemblies have a measurement over 80N then get them force matched to bring them under this figure. The wheels should be weight balanced too.

If the garage don’t understand your request, call another garage.

IMO the op is going to be making lots of calls

[CoolHands]

It’ll be fine once he gets it booked into an F1 team

[Kawasicki]

30 seconds of searching- no idea how good these guys are though

First Aid Wheels

174 Mill Lane

West Heath Yard

NW6 1TB

Landline: 020 7435 0941

Mobile: [phone]

Email: [e-mail]

Road Force balancing can be only performed in Golders Green branch: FAW Customs, 143 North End Road, NW11 7HT

Edited by Kawasicki on Thursday 21st April 09:39

[300bhp/ton]

FastEdd11e said:

As a lover of petrol but one who has no clue for maintenance, I need your help.

Our Maserati Ghibli has an annoying brake judder for the drivers side rear wheel.
We changed the rear discs, no change.

What next?

Warped rim?

Your help is appreciated.

Thanks.

If it's none of the things mentioned thus far. Do some reading on runout.

https://www.google.com/search?q=brake+judder+runou...

Quite a common cause of brake judder.

[littleredrooster]

Have you checked all the suspension bushes, especially those at the outer ends of any arms? Is the judder felt through the car, or through the pedal as 'pulsing'?

[Smint]

I'd go around the whole car removing the pads and servicing the calipers properly, making sure any sliders are working freely, pistons moving smoothly in their bores and the pads a nice fit in the castings without needing force to move, check does the caliper need a good clean up (sandpaper/scraping/wire brushing) where the pads sit and move gradually along as they wear...lubing up where necessary with the correct brake grease on reassembly.
Lack of properly serviced brakes causes all sorts of issues, suggest you rule that out first.

[FastEdd11e]

Kawasicki said:

30 seconds of searching- no idea how good these guys are though

First Aid Wheels

174 Mill Lane

West Heath Yard

NW6 1TB

Landline: 020 7435 0941

Mobile: [phone]

Email: [e-mail]

Road Force balancing can be only performed in Golders Green branch: FAW Customs, 143 North End Road, NW11 7HT

Edited by Kawasicki on Thursday 21st April 09:39

I used to live in West Hampstead but have now set myself free in Wiltshire.

Our local tyre chap thinks it's the front brakes. The rear discs and pads have just been changed. The fronts are now 51k miles old so it's fair to have them replaced. The holes in the discs are also caked full of brake dust and are looking pretty worn.

He recommended a diagnostic machine which measure judder, or something, and he's confident it's the front discs and pads.

They are due replacing so I'm going to plump for that.

So far as the chap with the 911 is concerned, thanks for the tips. The rear tyres are new and fronts 80% new. I had the rears changed in January so am confident it's not them.

Thanks.

[davidexige]

Don’t know if this will help, but this is from my personal experience, if it’s a problem with the front brakes I could feel the judder through both the steering wheel and brake pedle, if it’s the rears I could only feel it through the brake pedle.

Edited by davidexige on Friday 22 April 09:19

[FastEdd11e]

davidexige said:

Don’t know if this will help, but this is from my personal experience, if it’s a problem with the front brakes I could feel the judder through both the steering wheel and brake peddle, if it’s the rears I could only feel it through the brake peddle.

Thanks.
It is now both. Your pointer does make sense.

[DodgyGeezer]

FastEdd11e said:

davidexige said:

Don’t know if this will help, but this is from my personal experience, if it’s a problem with the front brakes I could feel the judder through both the steering wheel and brake peddle, if it’s the rears I could only feel it through the brake peddle.

Thanks.
It is now both. Your pointer does make sense.

mine was slightly (and IMO) weirdly different. Had brake judder I could feel through the body of the car when slowing from 50/60 - steering wheel steady as a rock... Long story short, my calipers had been playing up a little due to lack of use and my front discs and pads were toast.

The other thing could be wheel balancing (a weight has dropped off)

[anonymous-user]

Kawasicki said:

30 seconds of searching- no idea how good these guys are though

First Aid Wheels

174 Mill Lane

West Heath Yard

NW6 1TB

Landline: 020 7435 0941

Mobile: [phone]

Email: [e-mail]

Road Force balancing can be only performed in Golders Green branch: FAW Customs, 143 North End Road, NW11 7HT

Edited by Kawasicki on Thursday 21st April 09:39

No idea about the balancing thing but they also do a wheel swap refurb service, Assuming they have a set of your wheels in stock (and they have a lot) you swap your kerbed ones for a set of refurbed ones and they swap your tyres over, instead of leaving your car out of action for 2-3 days you’re done in an hour, much easier,
Obviously you have to trust that the replacement set will be ok but they seem to have high standards. They were brilliant for my BMW and their refurb quality is excellent.