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C4 - DS4 Owners :: Forums :: C4 Picasso and Grand Picasso - PRE 2013 only :: C4 Picasso and Grand Picasso General questions
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What size torx for changing rear brakes on 58 plate?
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brakeq   
Fri Aug 19 2022, 06:07am
Member No: #60020
Joined: Aug 19 2022
Location: Cambridge
 As above, cant seem to find an answer to this and all the videos I've watched seem to say different sizes. Is there any way to find out apart from buying all the options?

Thanks
Farmerguy   
Fri Aug 19 2022, 09:47am
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 I used a pipe wrench / pliers
I broke one town, i think it was 50! I can go look as I bought a new one.
But the bolts were very tight on mine and rusted!
Farmerguy   
Fri Aug 19 2022, 10:43am
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 I just checked, i used a 1/2 " socket with a torx 50 to torque them down again.
Mine is a c4 Grand Picasso with 2.0 HDi engine, piloted 6speed manual and electrc hand brake.
brakeq   
Fri Aug 19 2022, 11:37am
Member No: #60020
Joined: Aug 19 2022
Location: Cambridge
 thanks a lot for the replies. I've got a 50 from changing pads on a c4 a few years ago but this is a different car and videos all over are saying e12 or e14 needed as well as a TX55 (and some say TX45).

Ive ended up buying a set that includes both the e12 and e14 and then a seperate tx55 from halfords.

Job to be done tomorrow so I can guarantee that as soon as I take wheels off I will need a 45 as its the only one i wont have!

Thanks again for your replies.
Farmerguy   
Fri Aug 19 2022, 11:51am
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 Yeah it often is this retarded! But i used big pliers for pipes as us plumbers use, they were really tight and would not want to break my new torx bit either!
vexorg   
Sat Aug 20 2022, 02:50am
Member No: #48843
Joined: Jul 06 2017
Location: Scotland
 Best just to buy a decent set of each
brakeq   
Sat Aug 20 2022, 10:17am
Member No: #60020
Joined: Aug 19 2022
Location: Cambridge
 I ended up picking up a 45, had a 50, bought a whole set of e10-20 or something. And then ordered a 55 off halfords for delivery today. Got the tyre off and brakes off. And its the 55 i need and DHL have cancelled the delivery.... Brilliant!
brakeq   
Sat Aug 20 2022, 01:04pm
Member No: #60020
Joined: Aug 19 2022
Location: Cambridge
 I am panicking now as i cant get the piston wound back in. Tried all directions i can think of with the windback tool and both the tools as well. Fluid reservoir is open.

Any tricks to this that you can think of??
Farmerguy   
Sat Aug 20 2022, 04:18pm
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 Never panic.
Did you notice the rubber boot twisting?
If so try spraying with WD-40 or equavalent, i even think they don't even rotate the same way!
I usually push them back a little with a c clamp. Then i took the calibers off the car, and rotated them out by screwing, then the complicated part starts, there is some clips inside and you can remove the auto tighter and handbrake push mechanism, i just cleaned the [%*^#@!] out if it, as is was near black oil inside, then greased everything up with the special grease for brake calibrs. New rubber and it went back together much easyer than out.
All i used to twist the piston was long nosed pliers and water pump knipex wrench.
The boots was very bad and rustet together with the caliber. Aluminum, steel, saltwater is a [%*^#@!] combination.
It really don't take much force to screw the piston out and later in, no air use to pump piston out!!
Also if you want to rebuild, i used a chisel and heat to remove the bolt on the lever arm, it was very tight too, and after rebuilt i used a 6 edge bolt instead.
 

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