Trying to find the size or code for brake discs without having to remove the wheel.

if you haven't already bought the discs, then buy quality after market units
the mileage indicates a brake problem but you didn't mention the reason for the disc replacement
if it is disc warping , the after market discs will resolve that problem
if it just disc wear then check that the callipers are free to move on the pins that allow them to self center on application
If it is just wear out problem , adjust your driving habits as if the car is driven economically, pad wear will exceed 100.000miles before needing replacement
have you git the correct pads in use for the driving conditions if they are wearing out
Talk with an accreted brake shop specialist as there are 3 different pad hardnesses for different conditions

the wheel size should be stamped on the side of the wheel.
for the Renault Clio it is usually a 185/60 R15.
it depends on the year, try this site to look it up.

Renault Clio Specs of wheel sizes tires PCD Offset and Rims for all model...

Hi there, I have a few steps here to help you out:

• With your hand brake ON, loosen the wheel bolts to hand tight, jack up front wheel, chock back wheels, and put axle stands/blocks in place (just in case) .
• Remove wheel. Disconnect pad wear wire, it pulls out of the connector.
• Remove lower caliper bolt (at the back of caliper at the bottom), need a 13mm ring spanner for head of bolt and 17mm to stop it spinning
• Use a screw driver between the back of the outer pad and the caliper to raise the caliper back away from the back of outer pad. Pivot caliper upwards to rest on top of wheel disc (good idea to tie it up with some wire) .
• Remove and discard old pads , clean out with wire brush and soft brush , don't breath in to much of the dust its nasty.
• Fit new pads (remember pad wear sensor on inside pad), make sure that the pads are in contact with the disc , and the top of them sitting flush with the rim of the disc, don't force them into this position they should naturally sit there.
• Lower caliper down into position, you may need to push back the piston further in order to make room for the new pads , do this with you hands or a small piece of timber. Keep an eye on the brake fluid reservoir , your pushing fluid back in so if its over full it may spill over. Refit lower caliper bolt (Renault say to replace this each time), and tighten. Reconnect pad wear sensor.
• Pump brake pedal until normal brake pressure returns.
• Remove axle stand/blocks, refit wheel and bolts, lower jack and tighten up wheel bolts.

Hope this helps...

How hard are you stepping on the brake pedal? What you are describing sounds like the ABS system activating. When you step on the pedal hard enough to engage the ABS the light will come on, in some cars it will blink. You will also feel the thumping/vibration in the pedal since the system works by repeatedly engaging and disengaging the brakes. If it is happening when you step lightly on the brakes then you may have a bad wheel speed sensor or possibly a bad or miss-adjusted brake switch.

1. Hand Brake ON , loosen wheel bolts to hand tight, jack up front wheel , chock back wheels , put axle stands/blocks in place (just in case) .

2. Remove wheel. Disconnect pad wear wire , it pulls out of the connector.

3. Remove lower caliper bolt (at the back of caliper at the bottom) , need a 13mm ring spanner for head of bolt and 17mm to stop it spinning

4. Use a screw driver between the back of the outer pad and the caliper to prise the caliper back away from the back of outer pad. Pivot caliper upwards to rest on top of wheel disc (good idea to tie it up with some wire) .

5. Remove and discard old pads , clean out with wire brush and soft brush , don't breath in to much of the dust its nasty.

6. Fit new pads (remember pad wear sensor on inside pad), make sure that the pads are in contact with the disc , and the top of them sitting flush with the rim of the disc, don't force them into this position they should naturally sit there.

7. Lower caliper down into position, you may need to push back the piston further in order to make room for the new pads , do this with you hands or a small piece of timber. Keep an eye on the brake fluid resivoir , your pushing fluid back in so if its over full it may spill over. Refit lower caliper bolt (Renault say to replace this each time), and tigthen. Reconect pad wear sensor.

8. Pump brake pedal until normal brake pressure returns.

9. Remove axle stand/blocks , refit wheel and bolts , lower jack and tighten up wheel bolts.

The Renault clio should be easy,.jack up one wheel and remove the wheel and see what if any special tools will be needed. most have two bolts that hold the caliper to the back plate. The caliper hold the pads. Some of thes bolts are Allen head, some are Torq head, all are metric. some are held in with clips, remove the retaining pins and pull the clips out and the caliper comes out the front. Press the piston back into the caliper, so the new pads will fit over the rotor.

here is procedure

Section 04-01: Suspension and Wheel Hubs, Front 1996 Taurus, Sable Workshop Manual
REMOVAL AND INSTALLATION Wheel Hub Bolt Removal

1. Raise vehicle on hoist.
   

1. Remove wheel and tire assembly. Refer to Section 04-04 .
   

1. Remove disc brake caliper (2B120), and front disc brake rotor (1125). Refer to Section 06-03 .
   

Brake Shoe and Lining Removal

1. Remove brake master cylinder filler cap (2162). Check fluid level in brake master cylinder reservoir (2K478). Remove brake fluid until brake master cylinder reservoir is half full. Discard removed fluid.
   

1. Raise vehicle on hoist. Refer to Section 00-02 .
   

1. Remove wheel and tire assembly from front disc brake rotor mounting face. Use care to avoid damage or interference with disc brake caliper (2B120), front disc brake rotor shield (2K004) or front wheel knuckle (3K185).
   

1. Remove rear brake pin retainers (2N386). ( I think it is a T 40 torx bit you need)
   

1. NOTE: It is not necessary to disconnect hydraulic connections.
   
   Lift disc brake caliper from front disc brake caliper anchor plate (2B292) and front disc brake rotor (1125). Do not pry directly against metal caliper piston or damage will occur.
   

1. Position disc brake caliper out of the way and support with wire to avoid damaging the disc brake caliper and front brake hose (2078).
   

1. Remove outer brake shoe and lining (2001) assembly from front disc brake caliper anchor plate.
   

1. Remove inner brake shoe and lining assembly.
   

1. Position lug bolt (1107) to clear front wheel knuckle (3K185).
   

1. Remove lug bolt from wheel hub (1104).
   
   
   
   

Installation

1. Install lug bolt into wheel hub.
   

1. Using a lug nut (1012), seat wheel hub bolt into wheel hub.
   

1. Install front disc brake rotor and disc brake caliper. Refer to Section 06-03 .
   

1. Install wheel and tire assembly. Tighten lug nut to 115-142Nm (85-104 lb-ft).
   

They should last at least 50000 miles. In some areas where salt brine is used this woul be reduced.

two brake shoes with a auto adjuster at the top ,handbrake lever on right shoe and two return springs .if you cant remember take the other side off and look at that

My Clio has 15 inch rims and takes a 185/55 R15 tyre. I don't know if all the models are the same. If you are replacing the rims be careful your new rims have the same number of stud holes (mine is 4) and the same pitch circle diameter (PCD) (mine is 100 mm I think).