NO - do not use that boot use this one instead its the best there is
dans super boot (thumpe)
thumpe is a member here great guy pm him or contact through e bay - he offers discounts to members .
as for the rear breaks - check the pedal and linkage carefully - see if every thing is ok not bent / loose /tweaked / missing.
also see if you have any fluid in the resivor - may have leaked out - or the shop filled it and there is air in the line because they forgot to blead it .
good luck