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Discussion Starter · #1 ·
hi all,

Baffling issue with my sisters in laws brakes, it is making a intermittent grinding type noise not on every rotation though and can feel slight knocks on pedal

Things done.
Checked rear discs ok put new pads on..
Replaced front disc and pads..
Drove with handbrake pulled up doesn't do noise so makes me believe this is something to do with the front as it only does it when pedal is pressed..

Any help will be greatly received
Thanks
 

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It could be where the new pads need to wear into the old disc but this would be every time the pedal is pressed (just need time to bed into the disc).
Also could be a pad miss aligned (not fitted fully in to the caliper) strip them down and copper grease the contact points (where the pads and calipers touch) Not the pad/disc contact area. Also check the slider pins on the front calipers (rub down with wet and dry sand paper if not smooth) then re-create with rubber grease.
It could also be the rears similar to the above-mentioned not fitting correctly.
 

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Discussion Starter · #3 ·
It could be where the new pads need to wear into the old disc but this would be every time the pedal is pressed (just need time to bed into the disc).
Also could be a pad miss aligned (not fitted fully in to the caliper) strip them down and copper grease the contact points (where the pads and calipers touch) Not the pad/disc contact area. Also check the slider pins on the front calipers (rub down with wet and dry sand paper if not smooth) then re-create with rubber grease.
It could also be the rears similar to the above-mentioned not fitting correctly.
Thanks for the advise, the issue was like this before I did all this and checked and still doing it that's why I'm baffled, done all above with grease as you've said and even grinded a little of the edge of pad so easy travel and release (always done this) on every pad change. Could it have anything to do with the brake servo/cylinder ?
 

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Ye I had to read twice as I see you only padded back and put new disc and pads on front, def go for rears aswell, pads n discs are cheap enough for the Astra to replace at the same time if your competent on changing yourself, I can see easily done by u.
 

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Discussion Starter · #6 ·
Would it not make the noise with the handbreak pulled up then if it were the rear?
The back pads were changed buy a mechanic about a month ago and she came to me a couple of days ago saying it making a noise for the past couple of days for me to take a look all round and find that the back spring on one side snapped and rear dampers both sides completely empty too. (Why the mechanic didn't notice beyond me) and makes me see why I choose to do myself rather than garage lol.
But upon me looking the front discs and pads had scores in so that's why changed but the back looked fine took them of and cleaned all up but still making noise at low speed braking.
Head scratcher for me
 

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If the mechanic didn't notice them broken bits alarm bells shud be ringing was he good enough to change back pads? Back def needs attention, hand brake up isn't sufficient test imo
 

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I'd take it apart myself if I was you at least then you would know what's what as there's bound to be something amiss some where else
 

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Just because the disks look fine doesn't mean they are. Warped disks will cause a pulse in the pedal but you would never notice just by looking at them. A good test although not conclusive is to spin the rear wheels. If it goes tight at a certian point but quite free at others then it's more than likely the disks
 

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Another thing did he wind the caliper in correctly on both sides also adjusted the handbrake cable.it could also be a sticking caliper
 

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Sure your not experiencing the abs switching on ?
 

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Discussion Starter · #12 ·
I've took the pads of the rear checked and put them back on cleaned and greased where applicable. I'm sure it's not the abs as it's only at low speeds.

Some more info has been brought to my attention is that she hit a round metal disc thing or something in the road and since that it has been making the noise and she said this hit the near side front wheel. Done a roadside check (no access the family pit do to another car having new engine in) and there seems to be a little play in the steering rack or track rod end could this have something to do with the noise?

Took for a drive and no play or rattle from steering inside nor not pulling
 

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Could even be possible buckled wheel slightly if she hit something (doubtful but always a possibility) ? probably best to get the wheel off again and have a wiggle about inside arch to see if anything makes a noise
 
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