Guidelines for bleeding
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When reconditioning or replacing brake callipers bleed the relevant brake pipe as follows.
The brake pedal must be depressed throughout the operation. This is so that the brake system is not drained of brake fluid.
If the braking system has been completely or partly drained, bleed the whole system.
NOTE:
Use only genuine Volvo brake fluid with designation Volvo DOT 4+. Never
reuse brake fluid. Always keep brake fluid in original packaging and well sealed.