Brake & Pad Question?

[ChrisThompo]

Yesterday had Hyundai I30 checked over in Hyundai garage.
Only thing came back was brakes and pads need changed.

Fronts Discs are 21mm to recommend limit of 21.4mm..

How much difference is the 0.4mm?
What is the start mm of new disc for Hyundai?

Pads are at 3.0. Is there a minimum amount for pads to go for to be unsafe?

Sorry with loads questions no good with cars !!

[DuraAce]

Probably 23-24mm new

Pads at 3mm is no good.
I would change them now (as your garage has already told you to!)

[Hammer67]

If, as you say you're no good with cars, then you locate someone you know who is.

Fitting new pads and discs really isn't difficult if you have the tools and the knowledge.

By buying the pads and discs from a local factor, someone like Euro Car Parts, and engaging a mate to fit them could save you £100 or more.

(I did some pads and discs for a mate with a VW Transporter and saved him nearly £300 on the price the garage quoted).

Pads with 3mm left could only be half worn and discs 0.4mm below min thickness wouldn't worry me as long as they are in decent condition otherwise.

I would run the car for another 1000 miles and re-measure the pads so you get an idea of the rate at which the pads wear.

That's what I would do, but if you can't be arsed with any of that just get the garage to go for it and relieve you of a heap of cash for piece of mind.

[DuraAce]

Hammer67 said:

Pads with 3mm left could only be half worn and discs 0.4mm below min thickness wouldn't worry me as long as they are in decent condition otherwise.

Behave. 3mm is well bellow half worn. 12-15 mm is a rough average for new pads not 6mm.

How far below min thickness would you continue to use the discs?

Ask them if the discs will pass or fail the mot....

[Welshbeef]

3mm on pads

When I clean my wheels I can see my pads they have only done 12k since changed but they visibly have the same amount of meat as my finger - and no I don’t have child like dainty hands and fingers.

Brakes discs pads tyres dampers springs and brake fluid bi annual change are what might save your life. As they wear stopping distance increases and depending on how hard you drive the car the discs could get too hot and become totally ineffective.

Change them as recommended - discs being BELOW the minimum thickness kind of tells you you’ve had the benefit of their life and it’s now time for that metal to be melted down and make new discs.

You could squeeze a few month months out of it but why? Change them and then you’ve the next thre years hassle free

[stevieturbo]

ChrisThompo said:

Yesterday had Hyundai I30 checked over in Hyundai garage.
Only thing came back was brakes and pads need changed.

Fronts Discs are 21mm to recommend limit of 21.4mm..

How much difference is the 0.4mm?
What is the start mm of new disc for Hyundai?

Pads are at 3.0. Is there a minimum amount for pads to go for to be unsafe?

Sorry with loads questions no good with cars !!

0.4mm, is 0.4mm

3.0mm is well worn....and how unsafe depends whether they took out all of the pads, or guessed some...and how long you intend to drive before getting them changed.

But the garage is basically telling you they need changed. So change them

[Tony1963]

I’ll add that this garage sounds like one you can trust, so give them your business and they’ll look after you in future.

If, on the other hand, you’ve no money available for this work right now, drive very carefully so you don’t need to brake hard from high speeds. You’ll probably get 1,000-5,000 miles out of them depending on driving conditions.

[GliderRider]

One of our club's gliders has a disc brake on its main wheel, and was leaking fluid. When inspected, it was found that the disc had worn way below minimum acceptable thickness, and the pads were also well worn. The combination of the two was sufficient for the piston to come so far out of the caliper when the brake was applied that the seal on the piston was exposed and brake fluid was leaking past it.

[GreenV8S]

That's a bit disconcerting. Is there a procedure to monitor the airworthiness and condition of that sort of thing? I'd have guessed it would be heavily regulated and logged, so it's hard to imagine how basic safety maintenance was skipped.

[GliderRider]

GreenV8S said:

That's a bit disconcerting. Is there a procedure to monitor the airworthiness and condition of that sort of thing? I'd have guessed it would be heavily regulated and logged, so it's hard to imagine how basic safety maintenance was skipped.

The manufacturer's maintenance manual has all the required information, but it was probably a case previously of only considering the wear in the pads and forgetting about the disc. It was during the annual inspection in which the wings are taken off and the fuselage either raised up or inverted for a thorough inspection that the root cause was found. I think it was assumed that the leaking fluid was due to a worn brake caliper seal until the disc thickness was measured.