Car problem, Peugeot 405

[RhynoCZ]

My brother's got a '93 2.0L 405 ABS and he's got problem with brakes. There's a lot of air coming into the system, when the car's not used. He bleeded the system, got new brake fluid in it and the system worked but then he parked the car for a week and it was all over again. The brake pedal goes to the floor and there's air in the system again. What'd you suggest before he spends money on it?

Thank you
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[P.addy]

The seals on the MC and the bleed area.

[RhynoCZ]

Gonna look into that, thanks
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[misscrabstick]

remove all the wheels, look at the calipers, look in the drums if not discs all round, look for fluid leaks, look at the mastercylinder where it bolts to the servo, wet? look at the abs unit, wet? if you can't find any wetness assume the mastercylinder is bad and swop it out and bleed the system, be warned though bleeding abs systems after a mastercylinder change without a pressure bleed system can be problematic sometimes.

[RhynoCZ]

Everything's nice and dry, I gonna try to change seals in the master cylinder and if nothing, then I'm gonna tell my brother to get a new MC

Thanks again
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor