40 Years of Siebenrock – A Heartfelt Thank You!

 

Since 1985, the name Siebenrock has stood for quality, technical expertise, and genuine passion for classic BMW motorcycles.
Our success is built on continuous development, solid engineering knowledge,

and the ambition to create products that impress with functionality and durability.

  

A major milestone – and one we’d love to celebrate with you!

 

From July 4 to 16, 2025, enjoy a special anniversary discount on selected Siebenrock items in our online shop – it’s worth a look!

 

Or come see us in person at the BMW Motorrad Days in Garmisch-PartenkirchenJuly 4–6, 2025.

Visit our stand and receive an exclusive anniversary gift – a little surprise from us to you!

 

 Your Siebenrock Team

 

While supplies last.

 

Jump to main content
Categories

Repair kit brake master cylinder 20mm

BMW 4V Boxer and K 4V models

Artikelbild
€63.90

Prices incl. VAT, plus shipping costs

Ready to ship today, Delivery time appr. 2-4 workdays within Germany

  • 3272140R
Riders of many four-valve Boxers and K-models can now save a lot of money: The new repair and... more
Repair kit brake master cylinder 20mm
Riders of many four-valve Boxers and K-models can now save a lot of money: The new repair and sealing kit includes all the parts you need to repair the original Magura brake master cylinder in case of corrosion or sluggishness. No expensive replacement needed. The only condition: The cylinder must be okay inside.

Main brake cylinder 20mm
This repair kit is eloxed inside.
Price per piece.

TIP
You can find the specifications for your piston diameter on the underside of the master brake cylinder.

For BMW models
R 850R, R 850RT, R 850GS, R 1100GS, R 1100RT, R 1100RS, R 1100R, K1, K 100RS 4V, K 00RS, K 1100LT

ATTENTION:
Only for repair in a specialist workshop!

Compare 32722322037

Information on product safety
Fits for BMW Others: Other
Read, write and discuss reviews... more
Customer evaluation for "Repair kit brake master cylinder 20mm"
Write an evaluation
Evaluations will be activated after verification.

The fields marked with * are required.

NEW
3431926_1 Repair kit Brake master cylinder 14mm
BMW /6, /7 models from 9/1975 on

€109.00
Prices incl. VAT, plus shipping costs
Part no. 3431926
Artikelbild Repair kit brake master cylinder 14mm
BMW Monolever models
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272785R
Artikelbild Repair kit brake master cylinder 13mm
BMW 2-valve Boxer models
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272784R
Artikelbild Repair kit brake master cylinder 12mm Front
BMW R 65GS, R 80G/S, R 80ST, R 45, R 65
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272369R
Artikelbild Gasket Set
For Karcoma fuel tap
BMW 2-valve Boxer models

€12.95
Prices incl. VAT, plus shipping costs
Part no. 1612869
Artikelbild Hall sensor
BMW 2v Boxer models from 9/80 on
€129.90
Prices incl. VAT, plus shipping costs
Part no. 1200088
Artikelbild Strainer Fuel tap
Karcoma
BMW 2-valve Boxer models
€9.50
Prices incl. VAT, plus shipping costs
Part no. 1612112
Artikelbild Fuel tap
Right side
BMW 2-valve Boxer models

€49.50
Prices incl. VAT, plus shipping costs
Part no. 1612114
Artikelbild Fuel tap
Left side
BMW 2-valve Boxer models

€49.50
Prices incl. VAT, plus shipping costs
Part no. 1612113
Artikelbild Fuel tap
Straight Karcoma
BMW 2-valve Boxer models

€54.90
Prices incl. VAT, plus shipping costs
Part no. 1612557
Artikelbild Clutch switch / Stoplight switch
BMW 2v Boxer models
€29.95
Prices incl. VAT, plus shipping costs
Part no. 6131569
Artikelbild Brake line stainless steel
Low handlebar
BMW R 45, R 65 up to 9/80
Dual brake disc
€98.00
Prices incl. VAT, plus shipping costs
Part no. 3432826
Artikelbild Headlight
BMW R 65GS, R 80G/S, R 80GS, R 100GS, R 80GS Basic
LED technology
€349.00
Prices incl. VAT, plus shipping costs
Part no. 6312022L
Artikelbild Valve Cover Retro
BMW 2v Boxer models
Black Semi-matt
€66.00 €89.90
Prices incl. VAT, plus shipping costs
Part no. 1112246
Artikelbild Sticker R 65 battery cover
BMW R 65 models
€9.95
Prices incl. VAT, plus shipping costs
Part no. 4663098
Artikelbild Indicator unit
LED technology
BMW /7, Monolever models

€189.00
Prices incl. VAT, plus shipping costs
Part no. 6211780
Artikelbild Brake line stainless steel
BMW R 80/7, R 100/7
With high handlebar
€98.00
Prices incl. VAT, plus shipping costs
Part no. 3432566
Artikelbild Indicator light cover
English lettering
BMW R 65GS, R 80G/S, R 80GS, R 100GS, R 80GS Basic
€22.00 €29.70
Prices incl. VAT, plus shipping costs
Part no. 6221755
Artikelbild Repair kit brake master cylinder 15mm
BMW 2-valve Boxer models
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272370R
Artikelbild Repair kit brake master cylinder 16mm
BMW Boxer models from 9/80 up to 9/81
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272365R
Artikelbild Repair sleeve Float needle valve
BING Vergaser 64/32, 94/40
from 9/80
BMW 2-valve Boxer models
€3.99
Prices incl. VAT, plus shipping costs
Part no. 1311772
Artikelbild Valve keeper
BMW R 45, R 65 models
€1.95
Prices incl. VAT, plus shipping costs
Part no. 1134136
Artikelbild Alternator rotor
New part
BMW 2-valve Boxer models

€114.65
Prices incl. VAT, plus shipping costs
Part no. 1231641
Artikelbild Brake line stainless steel
BMW R 45, R 65
Monolever R 65, R 80
€54.00
Prices incl. VAT, plus shipping costs
Part no. 3432581
Artikelbild Oilfilter Set
Mahle
BMW 2v Boxer models without oilcooler
OX37D two-piece
€14.25
Prices incl. VAT, plus shipping costs
Part no. 1142145
Artikelbild Oilfilter Set
Mahle
BMW 2v Boxer models with oilcooler
OX36D two-piece
€14.90
Prices incl. VAT, plus shipping costs
Part no. 1142146
Artikelbild Seat pan holder
Repair set
BMW R 80GS, R 100GS R 80R, R 100R
€19.00
Prices incl. VAT, plus shipping costs
Part no. 5253170
Artikelbild Pushrod tube seal
18mm
BMW 2v Boxer models from 9/75 on
€3.95
Prices incl. VAT, plus shipping costs
Part no. 1132995
Artikelbild Speedometer cable boot Gearbox input
BMW 2-valve Boxer models
€7.90
Prices incl. VAT, plus shipping costs
Part no. 6113170
Artikelbild Nut for ARP
For conrod bolts
Siebenrock Big Bore Kit
€7.90
Prices incl. VAT, plus shipping costs
Part no. 1109001
Artikelbild Valve guide
BMW 2V Boxer models
Not for R 45 and R 65
€14.30
Prices incl. VAT, plus shipping costs
Part no. 1112708
Artikelbild Fork gaiter
11 ribs
BMW /6 and /7 models
€37.25
Prices incl. VAT, plus shipping costs
Part no. 3142908
Artikelbild Rear bag GS
BMW 2V Boxer G/S, ST, GS models
Made of sturdy leather
€169.00 €219.00
Prices incl. VAT, plus shipping costs
Part no. 4654200
Artikelbild Breaker contact
With long wiring
BMW 2v Boxer models up to 9/78

€13.95
Prices incl. VAT, plus shipping costs
Part no. 1211555
Artikelbild Sticker fuel tank
Left side
BMW R 65GS, R 80G/S
€25.75
Prices incl. VAT, plus shipping costs
Part no. 1611363
Artikelbild Sticker fuel tank
Right side
BMW R 65GS, R 80G/S
€25.75
Prices incl. VAT, plus shipping costs
Part no. 1611364
Artikelbild Spring
BMW /6, /7 models
For ATE brake caliper
€9.84
Prices incl. VAT, plus shipping costs
Part no. 3411513
Artikelbild Mirror metal
BMW 2-valve Boxer models
Short Left side
€48.70
Prices incl. VAT, plus shipping costs
Part no. 5116555
Artikelbild Fork tube
BMW R 80R, R 80R Mystic, R 100R, R 100R Mystic
€219.00
Prices incl. VAT, plus shipping costs
Part no. 3142831
Artikelbild Brush Set
Alternator
BMW 2-vave Boxer models

€5.70
Prices incl. VAT, plus shipping costs
Part no. 1231480
NEW
1101200_1 Big Bore Kit 1070cc "S"
BMW R 100 models from 9/80 on
Conrods 151,0 mm
€2,590.00
Prices incl. VAT, plus shipping costs
Part no. 1101200
Artikelbild Repair kit brake master cylinder 15mm
BMW 2-valve Boxer models
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272370R
5253835_1 Seat S
BMW R 80, R100 models from 9/83 on
€595.00
Prices incl. VAT, plus shipping costs
Part no. 5253835
NEW
1109210_1 Cylinder "S"
Big Bore Kit "S"
98mm
€459.00
Prices incl. VAT, plus shipping costs
Part no. 1109210
Artikelbild Repair kit brake master cylinder 16mm
BMW Boxer models from 9/80 up to 9/81
€63.90
Prices incl. VAT, plus shipping costs
Part no. 3272365R
Artikelbild Testing and adjustment equipment
Hall sensor
BMW 2v Boxer models
€49.50
Prices incl. VAT, plus shipping costs
Part no. 1200087
Artikelbild Speedometer cable boot Gearbox input
BMW 2-valve Boxer models
€7.90
Prices incl. VAT, plus shipping costs
Part no. 6113170
Artikelbild Conrod screw
ARP Racing
Siebenrock Big Bore Kit
€69.00
Prices incl. VAT, plus shipping costs
Part no. 1109004
Artikelbild Conrod
Sieenrock Big Bore Kit Touring
150,5 mm
€309.00
Prices incl. VAT, plus shipping costs
Part no. 1109044
Artikelbild Carb gasket Set

BING carburator
64/26, 64/28, 64/32, 94/40
BMW 2-valve Boxer models
Without diaphragm
€19.95
Prices incl. VAT, plus shipping costs
Part no. 1311951
1100103_1 Replacement Kit Extra 1000cc
Plug & Play
BMW R 100, R 100CS, R 100RS, R 100RT, R 100GS, R 100R
From 09/180 on
€1,139.00
Prices incl. VAT, plus shipping costs
Part no. 1100103
Artikelbild Cylinder gasket Set
From 9/1980 on
For Power Kit 1000cc, Replacement Kit
1000cc, BMW R 100 models from 9/80 on
€47.50
Prices incl. VAT, plus shipping costs
Part no. 1100101
Artikelbild O-Ring seal cylinder base
BMW 2V Boxer models
Small
€1.10
Prices incl. VAT, plus shipping costs
Part no. 1111141
Artikelbild Clutch centering tool
BMW 2-valve Boxer models from 9/80 on
€15.80
Prices incl. VAT, plus shipping costs
Part no. 2123512Z
Artikelbild Pushrod tube mandrel
18mm
BMW 2V Boxer models from 9/75 on

€8.90
Prices incl. VAT, plus shipping costs
Part no. 1111906
NEW
1100065_1 Power Kit Extra 1000cc 99mm
Plug & Play
BMW R 60/6, R 60/7 from 9/1975 on
€999.00 €1,159.00
Prices incl. VAT, plus shipping costs
Part no. 1100065
NEW
1100062_1 Power Kit Extra 1000cc 97mm
Plug & Play
BMW R 60/5 , R 60/6 up to 9/1975
€999.00 €1,159.00
Prices incl. VAT, plus shipping costs
Part no. 1100062
NEW
1113093_1 Siebenrock FM Oil pan
BMW 2-valve Boxer models
Black Logo and fins polished
€700.00 €879.00
Prices incl. VAT, plus shipping costs
Part no. 1113093
NEW
1113080_1 Siebenrock FM Oil pan
BMW 2-valve Boxer models
Basic
€555.00 €685.00
Prices incl. VAT, plus shipping costs
Part no. 1113080
NEW
Artikelbild Single seat
BMW R 100RS
Other 2V Boxer models
€666.00 €799.00
Prices incl. VAT, plus shipping costs
Part no. 5255835
Artikelbild Steering lock
With key
BMW 2v Boxer models from 9/73 on
€49.50
Prices incl. VAT, plus shipping costs
Part no. 5125274
3353733Y_1 Shock YSS
BMW R 65GS, R 80G/S
"G/S Sport" Black edition
€498.00
Prices incl. VAT, plus shipping costs
Part no. 3353733Y
Artikelbild Fork tube
BMW K 1200RS
€169.00
Prices incl. VAT, plus shipping costs
Part no. 3142227
5253843_1 Single seat cover G/S
Simple reproduction
BMW R 65GS, R 80G/S, R 80G/S PD, R 80ST, R 80GS Basic
€59.00
Prices incl. VAT, plus shipping costs
Part no. 5253843
5253335_1 Single seat GS
BMW R 80GS, R 100GS, R 80GSPD, R 100GSPD
€335.00
Prices incl. VAT, plus shipping costs
Part no. 5253335
NEW
5253128_1 Seat Support rubber
10mm
BMW 2-valve Boxer models
€2.95
Prices incl. VAT, plus shipping costs
Part no. 5253128
NEW
5253319_1 Seat Support rubbert
5mm
BMW 2-valve Boxer models
€3.10
Prices incl. VAT, plus shipping costs
Part no. 5253319
Artikelbild Cylinder. Right side
Siebenrock Power Kit 860cc
BMW R 45 and R 65 models up to 9/1980
€329.00
Prices incl. VAT, plus shipping costs
Part no. 1100866R
Artikelbild Cylinder. Right side
Siebenrock Power Kit 860cc
BMW R 45 and R 65 models from 9/1980 on
€315.00
Prices incl. VAT, plus shipping costs
Part no. 1100865R
1311361_1 Countersunk screw
BING carburetor 64/32, 94/40
BMW 2V Boxer models
€1.95
Prices incl. VAT, plus shipping costs
Part no. 1311361
1311409_1 Tension spring for choke lever
BING carburetor 94/40
BMW 2V Boxer Models
€9.15
Prices incl. VAT, plus shipping costs
Part no. 1311409
1311908_1 Throttle return spring
BING carburetor 64/32
BMW /5, /6, /7 models
€4.75
Prices incl. VAT, plus shipping costs
Part no. 1311908
1311745_1 Throttle shaft
BING carburetor 94/40
BMWR 100, Monolever, Paralever
€24.50
Prices incl. VAT, plus shipping costs
Part no. 1311745
1311298_1 Mixture tube/main jet holder
BING carburetor 94/40
BMW R 80, R 100 models
€14.50
Prices incl. VAT, plus shipping costs
Part no. 1311298
1311519_1 Idle jet 45
BING carburetor 64/32, 94/40
BMW 2V Boxer models
€21.90
Prices incl. VAT, plus shipping costs
Part no. 1311519
1311428_1 Main jet 160
BING Carburetor 94/40
BMW R 100 models
€10.50
Prices incl. VAT, plus shipping costs
Part no. 1311428
1311134_1 Spring for throttle piston
BING carburetor 64/32
BMW R 65, R 80, R 100 models
€11.40
Prices incl. VAT, plus shipping costs
Part no. 1311134
1311321_1 Nozzle needle
BING carburetor 94/40
BMW R 80, R 100 models
€11.40
Prices incl. VAT, plus shipping costs
Part no. 1311321
1311746_1 Throttle body
BING carburetor 94/40
BMW R 100, Monolever, Paralever
€15.50
Prices incl. VAT, plus shipping costs
Part no. 1311746
NEW
1372362_1 Intake rubber carburetor
D=62mm
BMW R 100 Paralever models

€17.90
Prices incl. VAT, plus shipping costs
Part no. 1372362
Viewed