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Their pistons are coated unlike the renault ones, which then deteriorate, crack and causes them to stick, mine failed quickly after very little use, If your only getting an intermittent issue then it could be the master cylinder, it sounds to still be a brake issue
Sounds brake related, recheck the calipers, check disc are running true, test master cylinder, best for this to be done on a brake test machine really if its intermittent, that's where I'd start.
Were the calipers overhauled using big red pistons, if so then that might be the issue also
That's fine, if its just when accelerating it has to be either shafts, hubs, engine or box touching something, get it on axle stands, fire it up and have a mate find the issue
I just sprayed mine with wd40 and worked it up and down without taking it apart last month, had the same issue you had, worked it a good while and it's back to working fine, they basically never move much which is the issue.
I've had mine coated in wax a few times in the last 10yrs which has...
Spray some wd40 on the valve and work it up and down, most get sticky after a while.
The valve needs to be in the up position to get fluid through the valve, you'll only get a little if the axle is hanging down with car jacked up.
You can tie wrap the valve closed while you bleed it
Yeah it may not need fitted depending on the damper your fitting maybe, you'll know if you need it when you tighten the top mount prior to fitting it into the car, the play is obvious to see, search on here and it'll show you the washer somewhere, I don't have any pics unfortunately
There's a daft washer you need to fit with these topmounts or they knock, I had to fit it using B14 coilovers, it's either that or the bearing, I'd say washer first with that amount of play tbh
Be very wary letting someone else touch the engine before sending it back, as that more than likely will totally void the warranty, as right now they say there isn't an issue, very easy to switch blame.
I'd only use someone else should the problem not get resolved, you won't be able to...
Just take it back, it needs to be tested, likely a ring issue if it's down on power, if it is and you keep driving it it'll soon if not already be a liner issue also 🫣