Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

Zog · 2021-12-13 13:19:58

Mot failed. Braking imbalance. Offside front seems to be grabbing slightly as the wheel is rotated. Any ideas on how to fix it? I have it jacked up and the wheel's off.

OAT · 2021-12-13 13:58:14

A simple clean and lube would be a good start.

https://tinyurl.com/mrxfphdf

tee_cee · 2021-12-13 17:33:57

Zog wrote:

Mot failed. Braking imbalance. Offside front seems to be grabbing slightly as the wheel is rotated. Any ideas on how to fix it? I have it jacked up and the wheel's off.

Could be the caliiper sliding pin sticking, in which case the pads will be worn more on one side

Zog · 2021-12-13 18:02:25

Thank you.

I had a look. The brake pads on my van are the ones with the protuding lug on each end. Rust had caused the inner pad's lower lug to bind stiffly in the groove in the caliper, and wear a hole in the "shim" material between that and the cast iron of the caliper. I chipped away the rust and wire-brushed it, and swapped the top (good) shim thing (what are these called?) to make the main force bearing point OK.

Unfortunately, the pad had worn very unevenly indeed, so much so that only one edge of the hydraulic piston was bearing on the steel back of the pad, so I carefully hacksawed some slots in the pad, using beer-tin shim on the worn end, to prevent cutting into it, and using the slots as a depth guide filed away the thick unworn end of the pad, finishing with glass-paper on a flat hard rubbing block, taking care about the dust.

The now thinner pad is the one with electrical "sensor" connection.

Hopefully it will do now. When the other problems are fixed, the MOT man can telll me.

Edit: Supplementary question: Why has the bottom pin that the caliper slides on got a rubber sleeve on the inner end? Damping?

Last edited by Zog (2021-12-13 18:04:05)

OAT · 2021-12-13 20:04:42

Zog wrote:

Edit: Supplementary question: Why has the bottom pin that the caliper slides on got a rubber sleeve on the inner end? Damping?

Not sure what part but could it be a dust seal?

Zog · 2021-12-13 20:23:45

OAT wrote:

Zog wrote:
Edit: Supplementary question: Why has the bottom pin that the caliper slides on got a rubber sleeve on the inner end? Damping?
Not sure what part but could it be a dust seal?

Here is a picture of a front brake caliper guide slider pin kit:

https://ibb.co/kJXypc0

You can see that the shorter pin has a rubber sleeve that goes down the hole, to the "bottom" of it in fact. It makes getting the pin in and out quite a pull (or push). I thought it might to be to reduce possible chatter of the caliper were it to slide very freely, but I don't know. Just interested, that's all.

kenbw2 · 2021-12-13 20:53:46

I had to grease my pins recently because they were sticking like you say. I don't recognise the rubber sleeve, nor the 65mm pins. Just the compressible robber boots to keep the grease clean

Last edited by kenbw2 (2021-12-13 20:54:07)

vaz2121 · 2021-12-14 03:55:45

I too have had a sticky caliper on van that needed some lube ............
However a couple years ago now ... I fitted along with discs and pads a new caliper
I tend now to file the mount parts of new pads to smooth them off a bit and also makes them slightly smaller along with some copperslip before fitting ..............

I did this once to the rear brakes on a Vectra I had at time and was informed that there was something seriously wrong with my car because of the noise it made .............
I hadn't refitted the Anti Rattle Shims and this was the noise that was heard while moving...........
My thoughts on discovery of this ... If their rattling their not seized..............

Zog · 2021-12-14 11:03:20

It's not a sticky caliper slider pin, it's a design feature, as pictured. Perhaps the caliper is not the same as others, I know there are two types of pad, which are not interchangeable.

scotchjoe · 2021-12-14 11:17:00

You could also check the rear brake equalising valve is moving freely.
Those pins and rubbers look like they are off a RWD rear caliper from a mk7 transit.

Last edited by scotchjoe (2021-12-14 11:20:20)

Zog · 2021-12-23 12:49:43

New MOT issued. Wonderful.

vaz2121 · 2021-12-23 13:15:35

Zog wrote:

It's not a sticky caliper slider pin, it's a design feature, as pictured. Perhaps the caliper is not the same as others, I know there are two types of pad, which are not interchangeable.

My sticky Caliper was not the slider pins but the piston it's self not retracting properly and a quick stab on the pedal or a squirt of maitainance spray around the piston behind boot stopped the dragging squeek hence change as things were getting worse ...................

Anyway well done at resolving MOT issue ..............

Last edited by vaz2121 (2021-12-23 13:17:48)

Casper · 2021-12-23 14:23:14

My convoy MOT was up in November. As its the same time as my Maxus and VW i decided to leave it longer to split MOT dates up. Thought last week i was chancing my luck as its in the street. Organised storage but the location was/is 15 miles away down the A1 and i pass a ANPR camera. Bright idea was get it booked for an MOT and fail i can still drive it away from MOT station and worry about it come the spring. List of advisory's from last year, made no checks this year not even look at the lights just put it in expecting the fail. Well did the bloody thing not pass big_smile Still took it to storage area though as i wont use it till the weather turns for the better

vaz2121 · 2021-12-25 03:49:17

I got a pass on my MOT back in august or September and an advisory I got was a small section of floor near to where the sill connects just behind front wheel is getting cruddy and is coming from the inside out .. That's needing looked at .............

As I had sills fitted about a couple years ago for that very reason .........................
I've figure that the vapor barrier seal has been broken or breached and moisture is finding it's way down to the bottom inside of Van as it's now been converted for well over 10 ...12 yrs .......................

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#1 2021-12-13 13:19:58

Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#2 2021-12-13 13:58:14

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#3 2021-12-13 17:33:57

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#4 2021-12-13 18:02:25

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#5 2021-12-13 20:04:42

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#6 2021-12-13 20:23:45

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#7 2021-12-13 20:53:46

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#8 2021-12-14 03:55:45

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#9 2021-12-14 11:03:20

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#10 2021-12-14 11:17:00

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#11 2021-12-23 12:49:43

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#12 2021-12-23 13:15:35

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#13 2021-12-23 14:23:14

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

#14 2021-12-25 03:49:17

Re: Brake imbalance (FIAT Scudo 2004 2.0 JTD SX).

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