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Old 14-08-2014   #31
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Re: Rear brake caliper sticking

I remember years ago a few people worried about right rear braking harder than left rear, i have past mot data and videos on here( nearer bottom)around post 164
http://www.alfaowner.com/Forum/tunin...jtd-16v-7.html
I have had new disc pads and calipers off serviced sliders regreased etc and still had right brake more.
Id have to think its something designed in, like the way the cable splits or how the brake circuit is split.
Ive never felt the car twist due to this unbalance, so yours may be worse and another issue but dont be suprised to see a variance on the mot test machine.
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Last edited by sussexa; 14-08-2014 at 13:22.
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Old 14-08-2014   #32
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Re: Rear brake caliper sticking

Wow that fascinating, thank you!

I did a couple more tests on the motorway in the range that I used to felt it in the most but now it seems that it's gone, I can only feel it if I really really concentrate and even then not always.

But I have to say that it felt the same last year (slight pull to the right in the rear if you're really cautious) and I passed the MOT without a problem.
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Old 6 Days Ago   #33
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Re: Rear brake caliper sticking

Hi guys, I have to "renew" this thread.

I am currently runing 07' Bravo (66 kW) and having nearly similar issue with rear brakes as has been discussed above (and Stilo and Multipla has same rear brake calipers, if I am not wrong).

Shortly: Official service changed rear brake rotors and pads (but they missed to tight the bolts on left caliper ). Everything was ok, but after four month it started to get sticky - left side. I figgured out that dust covers on handbrake lines were broken, so I used a little bit of oil to get it lubed and fixed it with electrical type - so far, so good. During the march, the exhaust was changed together with handbrake cables for right and left side (ATE). It moves freely now.

Well the sticking got back and I figgured that it was caused by the handbrake "shaft" in caliper. I lubed it, it was fixed for 14 days and got sticky again. So, I have changed left rear caliper BUT there is still an issue

The left rear wheel is getting little bit hotter (+20-30 C) after normal town cruising for approx. 10 km. I have dissambled left rear caliper carrier, the guide pins were moving freely except the one with rubber sleeve on in, so I did a quick cleaning with new grease application (ATE Plastilube) and it was pretty smooth. I have also cleaned the pads brackets which are on the caliper carrier.
All in all, no big improve - when you lift the car you can still hear that the pads are touching the rotor completely, there is no place, if you rotate the wheel, when it just "hits it". If I do the same on the right side I can hear just two point when the pads hits the rotor and wheel moves "more" freely than on the left side.

Do you have any idea what to focus on? Did I missed something?
Thanks a lot.
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Old 6 Days Ago   #34
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Re: Rear brake caliper sticking

Do the pads move very freely in the mounting bracket?
Both caliper slide pins should have rubber boots protecting them.
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Old 6 Days Ago   #35
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Re: Rear brake caliper sticking

Ah, following some research ,
Ate plastilube is the wrong lube to use on slide pins . It is too sticky and only becomes stickier over time . It is meant to be used on the back of brake pads. plastilube also damages rubber , your protective boots are at risk.
Clean it all out.
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Last edited by jackwhoo; 6 Days Ago at 18:15.
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Old 6 Days Ago   #36
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Re: Rear brake caliper sticking

Thanks for reply.
I have bought new guide pins, some grease is attached to packaging so I am planning to change those completely.
Yup, rubber boots are fine, both of them are not damaged with "Bosch" logo on them, so they are genuine ones.
Those mouting brackets were cleaned with brake cleaner and lubed with grease, but they were coated with black paint (brake pads fitted are also genuine ones). I suppose that this could be also an issue, so I have prepared set of new ones (Textar, without paint) and I am going to change them. However on the right side they are coated too (I think that, because I was not disassembling that side) and it is not sticking.

Do you have any tip for a suitable grease? I got silicone one from ATE (bremszylinder paste, blue packaking aka "toothpaste", part no. 03.9902-0501.2./02 - cant post links), but I use it only when assembling calipers - lubraction of piston and piston seals, it could be used with DOT 3 and DOT 4 brake fluids. I did some searching and suitable is Bosch Superfit paste, but it is similar in composition as Plastilube...so?

Another thing I have noticed is that rubber sleeved pin is on the top position in the caliper carrier. When I looked up for those in Eper I have found that those pins with rubber should be located in the bottom position - could this be an issue?
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Old 6 Days Ago   #37
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Re: Rear brake caliper sticking

If you change pads on one side you must change pads on other side , always with exactly the same type of pad.

If the pads are not sliding fit it the caliper bracket they cannot move away from disc when not braking.
Often thick rust builds up on caliper bracket trapping pads and stopping them moving freely.
One solution is to file the edge of metal back plate of pad so it doesn't get trapped and slides easily.

Swap slide pin with rubber sleeve to bottom hole as eper shows though I expect little difference.
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Last edited by jackwhoo; 6 Days Ago at 18:10.
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Old 6 Days Ago   #38
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Re: Rear brake caliper sticking

On slide pins I clean thoroughly and use a small amount of CV joint grease
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Old 6 Days Ago   #39
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Re: Rear brake caliper sticking

Maybe continue with current pads until issue solved as current pads bedded in to discs
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Old 6 Days Ago   #40
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Re: Rear brake caliper sticking

I'll try to write it more precisely:

5/2016 - in Fiat service were fitted genuine brake rotors and pads on rear brakes (however even in genuine service, they forget to tight left caliper)
6/2016 - tighten the caliper and noticed damaged rubber boots on handbrake lines (lubricated and repaird boots with tape)
9/2016 - noticed the sticking left rear caliper, handbrake cable was moving fine, it was handbrake mechanism at caliper (pulled it back and wasnt using it)

3/2017 - exhaust change was necessary so the middle part of exhaust was changed with both handbrake cables and the handbrake mechanism at caliper was lubricated and started to moving freely
3/2017 - the lubrication of caliper lasted only for a few weeks, so it started seizeing once again
4/2017 - the rear left caliper was changed
5/2017 - noticed that the rear left wheel is hotter (approx 20C) than right one

Since that I was trying to fixed that - so I disassemble handbrake cables, both are moving freely. I also put away left caliper and watch for guide pins (as mentioned above) and pads brackets (did not perform this job on right side, as there is no problem at all I guess).
The problem is still there, so I am guessing what is the cause, as rotors and pads are new, cables are new and sticking caliper is also new... Will get the CV joint lubrication as the grease with new guide pins is very limited (approx 5 g).
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Last edited by mrbrain; 6 Days Ago at 19:38.
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Old 6 Days Ago   #41
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Re: Rear brake caliper sticking

only a thin layer of grease is needed on slide pins.
Make sure to clean out all the wrong grease.
To me it sounds like you are doing all the correct things.
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Old 5 Days Ago   #42
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Re: Rear brake caliper sticking

Are the pads tight fit in the calliper bracket or a loose sliding fit?
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Old 5 Days Ago   #43
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Re: Rear brake caliper sticking

I'll update when have some new info, I am pretty sick atm (some kind of flu or something).
When I tried to put pads back to cleared brackets it was hard to fit them. But when they were fitted the move was nice...
Another idea I got is to grind the pads "noses" which fits to those brackets (some paint streaks could be on the bottom sides).
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Old 5 Days Ago   #44
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Re: Rear brake caliper sticking

Very sorry to hear you are ill and wish you fast recovery.

Yes to filing or grinding the noses of pad metal plate . that was what I suggested but your description of noses is perfect.
You only need to grind one nose on each pad. Grind enough off so they are easy fit and move very freely.
Don't worry if you have to grind a little metal off as well as paint.

Get well soon, from England
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Old 4 Days Ago   #45
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Re: Rear brake caliper sticking

Quote Originally Posted by mrbrain View Post
Thanks for reply.
I have bought new guide pins, some grease is attached to packaging so I am planning to change those completely.
Yup, rubber boots are fine, both of them are not damaged with "Bosch" logo on them, so they are genuine ones.
Those mouting brackets were cleaned with brake cleaner and lubed with grease, but they were coated with black paint (brake pads fitted are also genuine ones). I suppose that this could be also an issue, so I have prepared set of new ones (Textar, without paint) and I am going to change them. However on the right side they are coated too (I think that, because I was not disassembling that side) and it is not sticking.

Do you have any tip for a suitable grease? I got silicone one from ATE (bremszylinder paste, blue packaking aka "toothpaste", part no. 03.9902-0501.2./02 - cant post links), but I use it only when assembling calipers - lubraction of piston and piston seals, it could be used with DOT 3 and DOT 4 brake fluids. I did some searching and suitable is Bosch Superfit paste, but it is similar in composition as Plastilube...so?

Another thing I have noticed is that rubber sleeved pin is on the top position in the caliper carrier. When I looked up for those in Eper I have found that those pins with rubber should be located in the bottom position - could this be an issue?
Silicone grease is best. It won't damage rubber.
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