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Discussion Starter · #1 ·
After 40 years of driving Volvos, this V70R is the first new one that I have bought. On all the previous ones, when getting in the car in the morning, there would be enough vacuum in the power brake reservoir for 2-3 full brake applications before starting the engine. As I understand it, this is a design safety feature so that should the engine stall, you still have plenty of power brakes to stop the car.<p>However, on my R, there is NO stored vacuum when I first get in the car. I typically do not use the hand brake when parking (bad thing to do if the rotors are hot), and when I step on the clutch to start the engine, I have to stand on the brake if on any incline at all to keep the car from rolling.<p>Yes, I know that I could simply pull the park brake before starting, but I never had to do this on any of my previous Volvos.<p>Can anyone shed light on this - is this right or do I need service <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <br>
 

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Re: Power Brakes? (OwlsInBog)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>OwlsInBog</b> »</i></TD></TR><TR><TD CLASS="quote">However, on my R, there is NO stored vacuum when I first get in the car. I typically do not use the hand brake when parking (bad thing to do if the rotors are hot)</TD></TR></TABLE><p>You do realize that the pads/calipers are not what's engaged when using the parking brake? There are shoes within the hub rear area that hold it.
 

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Re: Power Brakes? (OwlsInBog)

My brakes work prior to starting...
 

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Never had this problem, even parking on some ultra steep hills in Seattle. As mentioned, it isn't the pads & calipers that are being used when the hand brake is applied, so I don't see any reason for not using it.
 

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Discussion Starter · #7 ·
Re: Power Brakes? (MagoonR)

Yes - I know that there are shoes in a small drum in the hub, but the hub is still part of the rotor and heats with the rest of it. The shoes only contact two sections and can result in uneven cooling, though not as much of a problem as those systems that mechanically apply the disk pads.<p>Thanks to all for the comments confirming that there should be stored vacuum - looks like it is time for a service call to Volvo. Damn - I was hoping to avoid that because it is 1-1/2 hours to the nearest dealer. Before the trip I will do a visual on the vacuum lines for any obvious problems. Any techs out there that could offer advice on first places to check?
 

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Re: Power Brakes? (OwlsInBog)

I tried rolling my car forward without turning on the engine to make room for the trashcans. I almost rolled into my truck parked in front of me. I had to stand on the brakes hard! I didn't pump them, I just stepped down and nothing so I stood on the pedal with both feet, one on top of the other.
 

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Re: Power Brakes? (steamboatsig)

I was surprised by this issue once last week. I always park on a bit of an incline, and never had a problem in the past. The other morning I had to turn the key quickly to get some braking power. Haven't had a problem since.
 
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