brake discs replacing, front disc, rear disc, brake pads Renault scenic grand, brake fluid DOT 4 exchange, how to check brake discs thickness? how to tighten nut without wrench ratchet?

The safety is priority. Many of drivers never thought about checking their brake disc thickness.
Every part in a car get worn, and brakes are so important and they have to be properly maintaned.
It is not just brake pads you have to look after. Faulty brake discs may cause horrible accident...
As a student during my work placement I saw once, yes only once broken brake disc, and I still remember it. The main working part (discrotor) went apart from the wheel hub. Fortunately this happened when driver was taking his car from his driveway. If he would drive 50km/h, oh I don't even want think what would happen....

How to measure your disc thickness?
I used a caliper and 2 coins; of course you can do this without removing wheel.

 Measure the thickness of 2 coins, lets call it A


Stick them on both sides of the disc and measure

 Lets call it B, the thickness of your disc would be B-A.
In my situation I got:
Front disc thickness : 22mm while the minimum is 21.8mm (new disc I bought has 24mm)
Rear disc thickness:     8mm while the minimum is   9.5mm (new disc I bought has 11mm)
So, the rear disc were 1.5mm below the minimum...

 As you already know from previous post you will need to secure car, lift it, remove wheels etc.

Front and ONLY front piston can be pushed back by using two spanners as on picture. Old pads will be dumped so you can use them

Mounting bracket

Disc is fixed by 2 bolts, I would recommend you to clean (wired brush) wheel hub and grease it using WD40 or even cooking oil.

It takes a while and it is noisy, however for next few minutes you will have to batter the disc on top, bottom and sides alternately. Use your force as it will not go off the hub

Clean it, I used vodka

Comparing two discs

Mounting torque

Next few pictures has been taken before, these show how brake pads should be replaced

I had broken anti-rattle clip aka pad support plate, these are exactly the same as for Fiat Citroen Peugeot

Rear discs

New and old

Mounting bracket

 Removing the hub cap

Clean it (vodka)

New brake disc came with integrated bearing and ABS magnetic ring. As a set also came hub nut

280 for 7seater and 220 for 5 seater

Click on image for full size photo

Secure the nut

Hub cap

Rear caliper winding tool

Bleeder cap

Bleeding order

This is how look old brake fluid. New one looks similarly to the fresh cooking oil. It is yellow

Thx