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Discussion Starter · #1 ·
Well, I just wanted to add my name to the list of people who have experienced this. After owning our R for the above mentioned time and never experiencing it, it finally happened, and about 2 miles from our house. <p>I have to say that the "ticking" noise doesn't sound like the ABS activating. Much faster and "lighter", if that makes sense. <p>In any event, it has not repeated itself again (of course) and that particular hill is not one that I am likely to have to stop at very often (the light is not usually red and if it is, the traffic is backed up to where you would brake before the uphill section).
 

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Re: (Jexx)

Yes, but braking power wqas severly reduced, and it helped that I knew what was happening. I was not really pushing along, so I had plenty of room. But for sure, a loss of about 50% of braking power.
 

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Re: (Needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote">Yes, but braking power wqas severly reduced, and it helped that I knew what was happening. I was not really pushing along, so I had plenty of room. But for sure, a loss of about 50% of braking power. </TD></TR></TABLE><p>Damn that sounds scary.<p>Good thing you knew what was happening but what if you didn't... Volvo needs to get serious about this.
 

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Wow that is scary. Sure sounds like the ABS trying to "help" you but you indicated this probably wasn't the case.<p>If you figure out or have ideas on WTF it could have been please let me know.
 

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Re: (2005VolvoVR)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>2005VolvoVR</b> »</i></TD></TR><TR><TD CLASS="quote">Can you explain this uphill brake issue? I cant seem to find anything in the Google Search. </TD></TR></TABLE><br>This is a known, weird Volvo issue.<br>Happens rarely if ever but when it does it's scary.<br>It usually happens driving uphill slowly, you hit the brake and all you get is a hard pedal and the car doesn't stop.<br>Usually if you release the pedal and hit it again, it usually works. Very hard to impossible to duplicate.<br>What's happening is it appears for that split second there is no vacuum in the system; <B>no vacuum, no brakes</B>! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> <p>These cars have (as most cars have and every turbo and supercharged cars have), is a built in vacuum pump in the braking system.<br>Turbos and superchargers suck vacuum out of an engine particlarly with these low compression engines<br>Somehow at these (rare) times, it just fails to produce the required vacuum for the brakes to work!<p><br><BR><BR>
<i>Modified by JRL at 9:11 AM 7-4-2009</i>
 

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Isn't there a check valve inline with the vacuum source for the brake booster?<p>Maybe like you said in a rare instance the vacuum is used up, and the pump hasn't had time to replenish vacuum.
 

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Re: (JRL)

It is not hard to duplicate and it happens at faster braking speeds for me, not slow speeds.<p>Uphill exit a few miles from my parents exit where I can probably get it 20% of the time if I tried.<p>Anyway, Volvo sucks for not telling us that they have been looking into it and what the solution would be. It doesn't seen like they care about this particular problem. <IMG NAME="icon" SRC="http://********************/smile/emthdown.gif" BORDER="0">
 

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Re: (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">These cars have (as most cars have and every turbo and supercharged cars have), is a built in vacuum pump in the braking system.<br>Turbos and superchargers suck vacuum out of an engine particlarly with these low compression engines<br>Somehow at these (rare) times, it just fails to produce the required vacuum for the brakes to work!</TD></TR></TABLE><p>Ahhhh. OK, this explanation kind of makes sense to me. So, to make sure I'm interpreting the explanation correctly, under low to no acceleration (read uphill coasting) sometimes JUST the right pressure/vacuum (or lack thereof) conditions exist to starve the braking system? This as opposed to the computer interpreting the uphill coasting as being on ice, and intentionally retarding the braking system? I realize this must just be the symptom of a larger mechanical process that I'm ignorant of. (Thanks for the explanation).<p>For the record, I've experienced this as well (once). Its a bit unnerving. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0">
 

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Re: (michaelc)

I believe this is a hardware issue no vacuum.<br>I've had cars with little to no vacuum and this is the result.<br>My last street rod truck was the same way (I never installed an electic pump)<br>When cold or at slow speeds DOWN a hill (like my driveway <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> ) I had to go down <B>real carefully</B> and use a lot of pedal to stop the sucker but at normal speeds and on level ground, no problem
 

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Re: (michaelc)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>michaelc</b> »</i></TD></TR><TR><TD CLASS="quote"><br>For the record, I've experienced this as well (once). Its a bit unnerving. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"></TD></TR></TABLE><p>Yours is an '07 so I guess this problem effects all R years. <p>Does anyone know if the vanilla S60s have this problem?
 

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Re: (850arrrsaylikepirate)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>850arrrsaylikepirate</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Yours is an '07 so I guess this problem effects all R years. <p>Does anyone know if the vanilla S60s have this problem?</TD></TR></TABLE><p>I think for some reason this is a (P2) wagon issue.<br>I know some XC owners that this has happened to but no S60 owners have said anything to my knowledge
 

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Re: (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">...I think for some reason this is a (P2) <B>wagon </B>issue....</TD></TR></TABLE><p>Not true - I had it once in my sedan.
 

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Re: (Short Circuit)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Short Circuit</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Not true - I had it once in my sedan.</TD></TR></TABLE><br>OK, now we know it can happen in all the P2's.
 

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Re: After 3 years and 8 months, 60k miles.....uphill braking failure finally happened (Needsdecaf)

Happened to me, uphill, slow speed, about two miles from home. Fortunately I was able to roll through the light and make my turn. Unnerving. I posted about this a few months ago.
 

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Re: After 3 years and 8 months, 60k miles.....uphill bra ... (bethmedillustrator)

It's happened to me a couple of times over the years as well.
 

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Discussion Starter · #18 ·
Re: (michaelc)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>michaelc</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Ahhhh. OK, this explanation kind of makes sense to me. So, to make sure I'm interpreting the explanation correctly, under low to no acceleration (read uphill coasting) sometimes JUST the right pressure/vacuum (or lack thereof) conditions exist to starve the braking system? This as opposed to the computer interpreting the uphill coasting as being on ice, and intentionally retarding the braking system? I realize this must just be the symptom of a larger mechanical process that I'm ignorant of. (Thanks for the explanation).<p>For the record, I've experienced this as well (once). Its a bit unnerving. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"></TD></TR></TABLE><p>There are various theories why it happens. No one has gotten a real answer. <p>And for some it's easy to duplicate, for others impossible.
 

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Re: (Needsdecaf)

I've had it about 3 or 4 times in 5 years of ownership. Unnerving to say the least. It always happens when I'm braking for a stoplight (e.g. changing from green to yellow or yellow to red) on an uphill incline. Makes me wonder if it's something to do with the switching mechanism of the stoplight activating a split second before I apply the brakes. <p>My "cure" is to quickly release and re-apply the brakes. Seems to work, but I can't replicate the problem reliably enough to take it to the dealer. Since there's no TNN on it, they likely wouldn't be able to solve it. Shame on Volvo, the "safety car" company. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0"> This, and angle gears. <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0"> Pure cheese. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0">
 

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Thanks JRL for the good information. I think I too had this same issue happened to me the other night as I was slowing to turn into an uphill shopping center enterance. Some idiot driving a camry I think, was coming down the one way in my direction so I hit the brakes to avoid hitting said camry and nothing happened at first till I reapplied them. Kinda interesting...
 
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