Many shops will refuse to install a part from an outside supplier or
will significantly mark up the labor if they do, part of their profit is
on the sale of parts.

As for reasonable, I would expect it to be a couple hundred bucks
depending on what car this is.

cost about $105 Australian dollars so about 25% less in the USA Labour about
15 minutes to 20 minutes with coffee time thrown in .Its a very easy job .

I replaced the master brake cylinder on my '89 240 a couple years ago. It
was $24 at local AutoZone, job took about an hour or so. Bleeding the brakes
by the manual probably took longer than that!

Atlanta, GA

Hello John:

Very tough question to answer without knowing the year and model of
Volvo..and in which country and general area you reside.

Advise on that and I'll be better able to give an honest assesment if
the shop is in the Northeast US or Canada.

If not I'll leave it to others.

Regards,

Doc