HZ brake booster change Options

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Guest		#1 Posted : Tuesday, 3 January 2006 6:06:12 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		I was looking at my mates WB with the smaller brake booster and was wondering if it was a simple change to a HZ with std disc front and drum rear??? Would it require a master cylinder change?? This is purely for looks in my engine bay as I'm trying to get a super clean look.

Guest		#2 Posted : Tuesday, 3 January 2006 8:20:44 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		The WB master has the bolts offset, not horizontal like the earlier ones. I believe the WB master cyl also uses metric threads so you'd have to change your whole braking system to WB. I'm not sure about any differences to the brake pedal. Other t

HK1837		#3 Posted : Tuesday, 3 January 2006 7:23:18 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,740 Thanks: 1 times Was thanked: 516 time(s) in 492 post(s)		Have a look at a 4 wheel disc HZ brake booster. These are smaller and use the HZ style master cylinder.
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Guest		#4 Posted : Wednesday, 4 January 2006 12:47:29 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		I will check it out and let you know. Cheers Darren

classic oz wreck		#5 Posted : Wednesday, 4 January 2006 8:47:07 AM(UTC)
Rank: Veteran Reputation: Groups: Registered, Veteran Joined: 7/03/2005(UTC) Posts: 1,115		pedal bolt up is the same...
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Guest		#6 Posted : Wednesday, 4 January 2006 11:47:10 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Thanks Greg. Cheers...Dave

johnperth		#7 Posted : Thursday, 5 January 2006 12:17:36 PM(UTC)
Rank: Veteran Reputation: Groups: Registered, Veteran Joined: 1/03/2005(UTC) Posts: 1,991 Was thanked: 2 time(s) in 2 post(s)		The booster is designed for rear disks. It is double diaphragm as I understand it. Won't it cause lockup on the rear drum brakes/
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Guest		#8 Posted : Thursday, 5 January 2006 1:16:16 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		The booster will boost both circuits the same....I think the double diaphram boosters were introduced because 4 wheel discs need more assistance than a disc/drum setup. Cheers...Dave

johnperth		#9 Posted : Friday, 6 January 2006 10:20:19 AM(UTC)
Rank: Veteran Reputation: Groups: Registered, Veteran Joined: 1/03/2005(UTC) Posts: 1,991 Was thanked: 2 time(s) in 2 post(s)		That's my point. More assistance to the rear drums = lockup.
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Guest		#10 Posted : Friday, 6 January 2006 10:55:59 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		That's why they had proportioning valves.... Also, a double diaphram will supply extra boost (vacuum really) to BOTH lots of brakes....fronts as well as backs. If the brakes are adjusted correctly, both ends should lock almost simultaneously. Che

Guest		#11 Posted : Friday, 6 January 2006 8:43:01 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Hi Dave I like the sound of extra vacume as I have a custom floor mounted pedal system and the original brake pedal was shortened by an 1" causing a slight increase in braking force, but they have been tested and work correctly. I think the extra boost m

johnperth		#12 Posted : Saturday, 7 January 2006 6:47:03 AM(UTC)
Rank: Veteran Reputation: Groups: Registered, Veteran Joined: 1/03/2005(UTC) Posts: 1,991 Was thanked: 2 time(s) in 2 post(s)		I didn't think the HZ/WB had a proportioning valve I thought it was only the HQ.
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johnperth		#13 Posted : Saturday, 7 January 2006 6:48:25 AM(UTC)
Rank: Veteran Reputation: Groups: Registered, Veteran Joined: 1/03/2005(UTC) Posts: 1,991 Was thanked: 2 time(s) in 2 post(s)		Also the change to the pedal will have to be engineered and inspected and they hate brake pedals that have been cut.
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