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Parking brake adjustment



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Nigelcurry

Club Member

Tue 17 Apr 18 09:44

Parking brake adjustment


Hi all
The parking break on my 79 coupe may need adjusting in the near future and having taken a look at the hubs,I can only see holes for star wheel adjustment on the rear rotors,does this mean the parking break is only adjustable from the rear and there is no parking break operation from front.All the hubs still have the rivets in them so I,m thinking parking break operation is kind of similar to most cortinas of the seventies etc
Thanks for any feed back guys
Nige

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Redlevel

Club Member

Tue 17 Apr 18 10:12

Re: Parking brake adjustment


On my '87, all you have is a hole in the front of the drum/disc so you click the star wheel around with a screwdriver til the wheel locks then back it off four clicks so it runs free then adjust the cable to take up the slack. I usually click on the lever about two clicks before I start this.

A bit of advice is to lock a length of steel bar over the lug bolts (or refit the wheel if you can be *rs*d) to turn the hub as it's important to get a full revolution when you do this 'turn test' to negate any effect of a slightly oval drum that the parking brake shoes act upon.

Apologies if the '79 is different.. Smile

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Vetteheadtony

Club Member

Tue 17 Apr 18 12:07

Re: Parking brake adjustment


stevel98 wrote (View Post):On my '87, all you have is a hole in the front of the drum/disc so you click the star wheel around with a screwdriver til the wheel locks then back it off four clicks so it runs free then adjust the cable to take up the slack. I usually click on the lever about two clicks before I start this.

A bit of advice is to lock a length of steel bar over the lug bolts (or refit the wheel if you can be *rs*d) to turn the hub as it's important to get a full revolution when you do this 'turn test' to negate any effect of a slightly oval drum that the parking brake shoes act upon.

Apologies if the '79 is different.. Smile

Finally Steve someone knows how to properly adjust brakes, you should get a job at my Taxi’s main agent because none of the melts that work there seem to know!! Thumbs up


--------------------
Vetteheadtony
2004 Z06 lemans edition pro charged
613 BHP
Black C6 ZR1 wheels
FECKING FAST!!!

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Redlevel

Club Member

Tue 17 Apr 18 12:21

Re: Parking brake adjustment


Cheers! Very Happy

I got right into it because there are a few C4 n/s parking brake cables around that are in fact about 25mm too long! You don't notice it because your fitting a new cable and you expect it to be correct.

Mine came from a UK supplier. After an epic task of cursing and trying adjust the brake correctly, I eventually figured the cable was too long and it was. Bought another from Rockauto and compared them and sure enough the UK one was too long which meant it wouldn't pull up when adusted.

Assuming all parts are correct, the important part is to turn the hub a few 360deg revs to ensure it turns ok when you back it off.

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Nigelcurry

Club Member

Tue 17 Apr 18 16:18


Thanks gents
Please forgive me for sounding stupid but judging by your info the fronts don’t enter in to the operation,(haven’t been able to access underside of car yet)
Nige

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Redlevel

Club Member

Tue 17 Apr 18 16:36

Re: Parking brake adjustment


The e-brake system only operates on the rear wheels. The lever in the car will tug on twin cables, one to each back wheel.

If your taking a look at it, make sure the cables actually move when the lever is pulled as they can seize up. If they have seized, just buy new ones, don't waste time on the old ones trying to free them off.

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kentvette

Club Member

Tue 17 Apr 18 19:15

Re: Parking brake adjustment


Nigel

The adjustment of the C3 parking brake can be tricky to stay the least, and there is a "regime". It will help if you have the manual or the AIM, or at least a diagram of the adjuster mechanism in the rear "drum/rotor assembly".

Firstly, you'll need both rear wheels off the ground (car on jack stands) and remove them. (In an ideal world, remove the driveshaft and bake calliper, but thats's probably a step too far for now!) In the centre of the car you'll find the front cable joins the rear "cross-cable" and has a screw adjuster. Slacken this off.

Then, you'll need to turn the wheels so that you can get a screw driver into one of the larger holes and screw the adjuster in or out. (If you are very clever you'll be able to see the thread and work out which way to "click" the adjuster to get it to tighten the shoes, i.e. expand.) You want to screw it out so that you lock the wheel. Then release it about 8 - 10 "clicks" on the adjusting wheel. Do the other side the same. There then should be no sign of the brake shoes "dragging". Then, you'll need to tighten the central crew adjuster on the front cabe until it is tight enough to just move the rear cable. I do mean "only just"!

Replace the wheels and go for a test run of about 2 miles. Stop and immediately feel the rear wheel centres to see if they are hot. If so, the brakes are binding and you'll need to back off the wheel adjusters a tad. If not, great. And then, see if the parking brake actually works! Highly likely you'll be disappointed, but "Tthey are all like that, sir"!


--------------------
Stephen J Irons
CCCUK Lifetime Member
Corvette Club France
Corvettes of Southern California
NCM Family Member
Stephen & June's Web Site
Red Corvettes Have More Fun!

Apple IS Genisys!
The "Born-Again Greenies" are killing the planet! It's time to wake up and smell the rain-forest burning!

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roscobbc

Committee Member

Tue 17 Apr 18 20:12

Re: Parking brake adjustment


Its not a bad (albeit a little expensive) idea to replace all parking brake components at the same time. You don't really want to be doing the job twice - not saying its a nasty job (but it can be). Auto's usually have the worst issues with parking brake as its rarely used by many drivers. The steel brake mechanism rusts and seizes. The hot tip is to replace all components with stainless steel items. It'll stop corrosion but if you maintain things properly you won't have an issue with standard parts. The fundamental design of the parking brake is its main issue. You're asking for two pairs of Honda 50 sized brake shoes to arrest the movement of a vehicle 15 times the weight of the scoot. Irrespective of whether you use standard mild steel brake shoes or stainless they are all weak, thin and will flex with aggressive operation causing the lining material to crack. If the brake hub rivets are still in place then this will be the first time for a overhaul - you don't need to replace them. Best add a new parking brake cable to the list as they stretch with use and age.......



Last edited by roscobbc on Tue 17 Apr 18 22:10; edited 1 time in total. [0 %]
--------------------
CCCUK Chairman
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
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Nigelcurry

Club Member

Wed 18 Apr 18 08:59

Re: Parking brake adjustment


All great and VERY helpful advice and info thanks very much lads
Nige

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