Kuga Brakes Issue

[prepman]

There will be thousands of cars out there that are using more fuel and brake components than needed. It's so common to find sliders that are a bit sticky/semi seized, doesn't seem to affect braking operation and probably won't affect MOT test but will be having an effect.

Worst ones are the ones where the sliders are metal on metal, I remember checking over my wife's Discovery 2 over before we went on holiday years a go. It drove horrible pulling quite heavily, one slider was rusted in the mount. Took quite a bit of freeing up.

Most cars have way more braking power than they need these days so probably don't get a good workout to keep stuff moving.

The sliders on the rear brakes (combined HB) are steel sliders and even rotating the pins has difference in ease of movement. I am under the impression (I'm very impressionable ) that one pins is a close tolerance fit and the other has more clearance to stop trapezoidal jamming? Front brakes aren't really sliders with the rubber bush. It's the pads themselves with cow horns so both slide in the same caliper half.
The old system (wavy lines) used twin opposing pistons, so no sliders. Or at least all the ones I had, had.
With my memory deteriorating I almost forgot to digress....
With electronics on cars reliability (questionable IMHO)...I often wonder what the likelyhood of the steering lock coming on whilst batting down the motorway?

 

[armalites]

The sliders on the rear brakes (combined HB) are steel sliders and even rotating the pins has difference in ease of movement. I am under the impression (I'm very impressionable ) that one pins is a close tolerance fit and the other has more clearance to stop trapezoidal jamming? Front brakes aren't really sliders with the rubber bush. It's the pads themselves with cow horns so both slide in the same caliper half.
The old system (wavy lines) used twin opposing pistons, so no sliders. Or at least all the ones I had, had.
With my memory deteriorating I almost forgot to digress....
With electronics on cars reliability (questionable IMHO)...I often wonder what the likelyhood of the steering lock coming on whilst batting down the motorway?

There is often a PTFE sleave inside those rubber bushes, I bought a special carbide scraper on the Snap On van for cleaning slide ways on the mounts. It does a nice job.

My lads Yaris had some issue on the front brakes wearing unevenly, some had put quite a bit of effort in and done stuff nicely but the one thing they hadn't done was clean the mounts os the pads were jamming

 

[prepman]

There is often a PTFE sleave inside those rubber bushes, I bought a special carbide scraper on the Snap On van for cleaning slide ways on the mounts. It does a nice job.

My lads Yaris had some issue on the front brakes wearing unevenly, some had put quite a bit of effort in and done stuff nicely but the one thing they hadn't done was clean the mounts os the pads were jamming

The gaiters play a vital part as well. Quite often not given any attention by the 'experts'..

 

[armalites]

The gaiters play a vital part as well. Quite often not given any attention by the 'experts'..

When someone pays for pads to be replaced that's exactly what they get. When I see pistons that are a log way out I tend to pull the rubbers back and check the condition of pistons and give them a scrub. Some cheap pads fit poorly, I always check they move freely and have had to file edges before. I do quite a lot stuff for people but it's not my main income so I'm not under pressure to bang the jobs out.

Lots of cars don't even have gaiters especially on multi piston calipers. Classic Range Rovers, Discovery 1 have no gaiters on the pistons, those AP calipers were used in plenty of other stuff too. Some performance stuff like Brembo don't have them either.

 

[prepman]

When someone pays for pads to be replaced that's exactly what they get. When I see pistons that are a log way out I tend to pull the rubbers back and check the condition of pistons and give them a scrub. Some cheap pads fit poorly, I always check they move freely and have had to file edges before. I do quite a lot stuff for people but it's not my main income so I'm not under pressure to bang the jobs out.

Lots of cars don't even have gaiters especially on multi piston calipers. Classic Range Rovers, Discovery 1 have no gaiters on the pistons, those AP calipers were used in plenty of other stuff too. Some performance stuff like Brembo don't have them either.

Sorry I was referring to the slider pins.

 

[armalites]

Sorry I was referring to the slider pins.

Ah yes, the metal/metal ones have rubber gaiters

 

[PhillipM]

Most of the road going brembo's have piston gaiters. All mine certainly have/do

 

[prepman]

Well now it's the other side.... FOS You've got to laugh. 14yro cars tend to do that. Kit in post.

 

[Egi]

Help!
Having a spot of bother with the Kuga brakes ....again. Had issues with brakes rubbing in past and replaced rear calipers which fixed issue Dec 2021. Prior to this the ABS module packed in and was repaired by a very reputable firm.
Now I've got rubbing brakes again..... I ran car then used temp gun to measure disc temps.
Front OS and rear NS were high ~170C.
As this is diagonally across and not on one axle is it likely to be an ABS issue?
Aren't they paired like this?
No fault lights. Will run diagnostics tomorrow, but very limited with the little unit I have.

I have the same problem. NS rear brake disc rubbing in brake pads. Changed new caliper , new brake pads and new discs. But problem still the same.. Dont know what can be…

 

[Guzrik]

No idea how often this happens but I have had the same problems when the the compensator port of a master cylinder in a brake system is restricted.
It is a 0.5 mm orrifice so a little dirt or corrosion can cause this.
If the brakes drag and you wait ten minutes are they free?
Piercing it with a single hair from a wirebrush solved it.

 

[Farside]

No idea how often this happens but I have had the same problems when the the compensator port of a master cylinder in a brake system is restricted.
It is a 0.5 mm orrifice so a little dirt or corrosion can cause this.
If the brakes drag and you wait ten minutes are they free?
Piercing it with a single hair from a wirebrush solved it.

Really commonly found on bike master cylinders that have sat for a while.

 

[prepman]

Really commonly found on bike master cylinders that have sat for a while.

And quad bikes....as with my KLF300.